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-rw-r--r--src/devices/grodvi/grodvi.1.man15
-rw-r--r--src/devices/grohtml/grohtml.1.man15
-rw-r--r--src/devices/grolbp/grolbp.1.man15
-rw-r--r--src/devices/grolj4/grolj4.1.man15
-rw-r--r--src/devices/gropdf/gropdf.1.man15
-rw-r--r--src/devices/gropdf/pdfmom.1.man15
-rw-r--r--src/devices/grops/grops.1.man15
-rw-r--r--src/devices/grotty/grotty.1.man15
-rw-r--r--src/devices/xditview/gxditview.1.man15
-rw-r--r--src/preproc/eqn/eqn.1.man15
-rw-r--r--src/preproc/eqn/neqn.1.man15
-rw-r--r--src/preproc/grn/grn.1.man15
-rw-r--r--src/preproc/pic/pic.1.man15
-rw-r--r--src/preproc/preconv/preconv.1.man15
-rw-r--r--src/preproc/refer/refer.1.man15
-rw-r--r--src/preproc/soelim/soelim.1.man15
-rw-r--r--src/preproc/tbl/tbl.1.man15
-rw-r--r--src/roff/groff/groff.1.man15
-rw-r--r--src/roff/nroff/nroff.1.man15
-rw-r--r--src/roff/troff/troff.1.man15
-rw-r--r--src/utils/addftinfo/addftinfo.1.man15
-rw-r--r--src/utils/afmtodit/afmtodit.1.man15
-rw-r--r--src/utils/grog/grog.1.man15
-rw-r--r--src/utils/hpftodit/hpftodit.1.man15
-rw-r--r--src/utils/indxbib/indxbib.1.man15
-rw-r--r--src/utils/lkbib/lkbib.1.man15
-rw-r--r--src/utils/lookbib/lookbib.1.man15
-rw-r--r--src/utils/pfbtops/pfbtops.1.man15
-rw-r--r--src/utils/tfmtodit/tfmtodit.1.man15
-rw-r--r--src/utils/xtotroff/xtotroff.1.man15
30 files changed, 450 insertions, 0 deletions
diff --git a/src/devices/grodvi/grodvi.1.man b/src/devices/grodvi/grodvi.1.man
index 8d7be9e5e..05cbe0d40 100644
--- a/src/devices/grodvi/grodvi.1.man
+++ b/src/devices/grodvi/grodvi.1.man
@@ -31,6 +31,21 @@ output driver for TeX DVI format
.do nr *groff_grodvi_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.ie t .ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
.el .ds tx TeX
diff --git a/src/devices/grohtml/grohtml.1.man b/src/devices/grohtml/grohtml.1.man
index 4b8828124..2243b474c 100644
--- a/src/devices/grohtml/grohtml.1.man
+++ b/src/devices/grohtml/grohtml.1.man
@@ -31,6 +31,21 @@ output driver for HTML
.do nr *groff_grohtml_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/devices/grolbp/grolbp.1.man b/src/devices/grolbp/grolbp.1.man
index f6ff7a3a0..c8cda762b 100644
--- a/src/devices/grolbp/grolbp.1.man
+++ b/src/devices/grolbp/grolbp.1.man
@@ -36,6 +36,21 @@ output driver for Canon CaPSL printers
.do nr *groff_grolbp_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/devices/grolj4/grolj4.1.man b/src/devices/grolj4/grolj4.1.man
index 847d64451..622777985 100644
--- a/src/devices/grolj4/grolj4.1.man
+++ b/src/devices/grolj4/grolj4.1.man
@@ -31,6 +31,21 @@ output driver for HP LaserJet 4 and compatible printers
.do nr *groff_grolj4_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.\" This macro definition is poor style from a portability standpoint,
.\" but it's a good test and demonstration of the standard font
.\" repertoire for the devices where it has any effect at all, and so
diff --git a/src/devices/gropdf/gropdf.1.man b/src/devices/gropdf/gropdf.1.man
index db2b4b1f6..39eec969a 100644
--- a/src/devices/gropdf/gropdf.1.man
+++ b/src/devices/gropdf/gropdf.1.man
@@ -31,6 +31,21 @@ output driver for Portable Document Format
.do nr *groff_gropdf_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" This macro definition is poor style from a portability standpoint,
.\" but it's a good test and demonstration of the standard font
diff --git a/src/devices/gropdf/pdfmom.1.man b/src/devices/gropdf/pdfmom.1.man
index e77aff439..1b3dc014a 100644
--- a/src/devices/gropdf/pdfmom.1.man
+++ b/src/devices/gropdf/pdfmom.1.man
@@ -32,6 +32,21 @@ macro package for
.do nr *groff_pdfmom_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/devices/grops/grops.1.man b/src/devices/grops/grops.1.man
index 0280507af..6789fb244 100644
--- a/src/devices/grops/grops.1.man
+++ b/src/devices/grops/grops.1.man
@@ -31,6 +31,21 @@ output driver for PostScript
.do nr *groff_grops_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" This macro definition is poor style from a portability standpoint,
.\" but it's a good test and demonstration of the standard font
diff --git a/src/devices/grotty/grotty.1.man b/src/devices/grotty/grotty.1.man
index b7c429a88..3dcafaee7 100644
--- a/src/devices/grotty/grotty.1.man
+++ b/src/devices/grotty/grotty.1.man
@@ -31,6 +31,21 @@ output driver for typewriter-like (terminal) devices
.do nr *groff_grotty_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/devices/xditview/gxditview.1.man b/src/devices/xditview/gxditview.1.man
index 5e4646d66..920ccfdc4 100644
--- a/src/devices/xditview/gxditview.1.man
+++ b/src/devices/xditview/gxditview.1.man
@@ -35,6 +35,21 @@ intermediate output files in X11
.do nr *groff_gxditview_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/preproc/eqn/eqn.1.man b/src/preproc/eqn/eqn.1.man
index 75e4ced83..c6b5d3c78 100644
--- a/src/preproc/eqn/eqn.1.man
+++ b/src/preproc/eqn/eqn.1.man
@@ -32,6 +32,21 @@ or MathML
.do nr *groff_eqn_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.ie \n(.V<\n(.v \
. ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
diff --git a/src/preproc/eqn/neqn.1.man b/src/preproc/eqn/neqn.1.man
index 24f8942dd..539afd018 100644
--- a/src/preproc/eqn/neqn.1.man
+++ b/src/preproc/eqn/neqn.1.man
@@ -29,6 +29,21 @@
.do nr *groff_neqn_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/preproc/grn/grn.1.man b/src/preproc/grn/grn.1.man
index c8d3f9442..cbc15ae86 100644
--- a/src/preproc/grn/grn.1.man
+++ b/src/preproc/grn/grn.1.man
@@ -32,6 +32,21 @@ documents
.do nr *groff_grn_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/preproc/pic/pic.1.man b/src/preproc/pic/pic.1.man
index 838f98d70..ac2864189 100644
--- a/src/preproc/pic/pic.1.man
+++ b/src/preproc/pic/pic.1.man
@@ -31,6 +31,21 @@ or TeX
.do nr *groff_pic_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.\" Definitions
diff --git a/src/preproc/preconv/preconv.1.man b/src/preproc/preconv/preconv.1.man
index 0e888c567..1535bae88 100644
--- a/src/preproc/preconv/preconv.1.man
+++ b/src/preproc/preconv/preconv.1.man
@@ -30,6 +30,21 @@ preconv \- prepare files for typesetting with
.do nr *groff_preconv_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/preproc/refer/refer.1.man b/src/preproc/refer/refer.1.man
index dfae995ed..ad54ef317 100644
--- a/src/preproc/refer/refer.1.man
+++ b/src/preproc/refer/refer.1.man
@@ -30,6 +30,21 @@
.do nr *groff_refer_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/preproc/soelim/soelim.1.man b/src/preproc/soelim/soelim.1.man
index 484ce1f60..4a1c04296 100644
--- a/src/preproc/soelim/soelim.1.man
+++ b/src/preproc/soelim/soelim.1.man
@@ -31,6 +31,21 @@ or other text files
.\" Save and disable compatibility mode (for, e.g., Solaris 10/11).
.do nr *groff_soelim_1_man_C \n[.cp]
.cp 0
+.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
.\" Man pages are seldom preprocessed with pic(1).
.mso pic.tmac
.
diff --git a/src/preproc/tbl/tbl.1.man b/src/preproc/tbl/tbl.1.man
index 5466bbcda..6fd06d634 100644
--- a/src/preproc/tbl/tbl.1.man
+++ b/src/preproc/tbl/tbl.1.man
@@ -32,6 +32,21 @@ documents
.do nr *groff_tbl_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/roff/groff/groff.1.man b/src/roff/groff/groff.1.man
index 1759a6835..0873e175a 100644
--- a/src/roff/groff/groff.1.man
+++ b/src/roff/groff/groff.1.man
@@ -27,6 +27,21 @@ document formatting system
.do nr *groff_groff_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.\" Define a string for the TeX logo.
.ie t .ds TeX T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
.el .ds TeX TeX
diff --git a/src/roff/nroff/nroff.1.man b/src/roff/nroff/nroff.1.man
index 97c6aace7..6ccc9d49f 100644
--- a/src/roff/nroff/nroff.1.man
+++ b/src/roff/nroff/nroff.1.man
@@ -31,6 +31,21 @@ for TTY (terminal) devices
.do nr *groff_nroff_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/roff/troff/troff.1.man b/src/roff/troff/troff.1.man
index 0bbbb0770..2ab12b969 100644
--- a/src/roff/troff/troff.1.man
+++ b/src/roff/troff/troff.1.man
@@ -28,6 +28,21 @@ typesetter and document formatter
.do nr *groff_troff_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/addftinfo/addftinfo.1.man b/src/utils/addftinfo/addftinfo.1.man
index 3cad99a3c..a60e8dff7 100644
--- a/src/utils/addftinfo/addftinfo.1.man
+++ b/src/utils/addftinfo/addftinfo.1.man
@@ -32,6 +32,21 @@ fonts for use with
.do nr *groff_addftinfo_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/afmtodit/afmtodit.1.man b/src/utils/afmtodit/afmtodit.1.man
index 79b18feab..e1e69b261 100644
--- a/src/utils/afmtodit/afmtodit.1.man
+++ b/src/utils/afmtodit/afmtodit.1.man
@@ -31,6 +31,21 @@ PostScript and PDF output
.do nr *groff_afmtodit_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/grog/grog.1.man b/src/utils/grog/grog.1.man
index abd020604..b705866f4 100644
--- a/src/utils/grog/grog.1.man
+++ b/src/utils/grog/grog.1.man
@@ -28,6 +28,21 @@ command a document requires
.do nr *groff_grog_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/hpftodit/hpftodit.1.man b/src/utils/hpftodit/hpftodit.1.man
index e645beb7b..12e3af794 100644
--- a/src/utils/hpftodit/hpftodit.1.man
+++ b/src/utils/hpftodit/hpftodit.1.man
@@ -32,6 +32,21 @@ and
.do nr *groff_hpftodit_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/indxbib/indxbib.1.man b/src/utils/indxbib/indxbib.1.man
index dd14ac164..df02fccda 100644
--- a/src/utils/indxbib/indxbib.1.man
+++ b/src/utils/indxbib/indxbib.1.man
@@ -29,6 +29,21 @@
.do nr *groff_indxbib_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/lkbib/lkbib.1.man b/src/utils/lkbib/lkbib.1.man
index 6d485729d..6295e5bc1 100644
--- a/src/utils/lkbib/lkbib.1.man
+++ b/src/utils/lkbib/lkbib.1.man
@@ -29,6 +29,21 @@ lkbib \- search bibliographic databases
.do nr *groff_lkbib_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/lookbib/lookbib.1.man b/src/utils/lookbib/lookbib.1.man
index fcbb739d2..aab5a048b 100644
--- a/src/utils/lookbib/lookbib.1.man
+++ b/src/utils/lookbib/lookbib.1.man
@@ -29,6 +29,21 @@
.do nr *groff_lookbib_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/pfbtops/pfbtops.1.man b/src/utils/pfbtops/pfbtops.1.man
index 61314a8b9..3d1bed5d4 100644
--- a/src/utils/pfbtops/pfbtops.1.man
+++ b/src/utils/pfbtops/pfbtops.1.man
@@ -30,6 +30,21 @@ Font ASCII
.do nr *groff_pfbtops_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis
diff --git a/src/utils/tfmtodit/tfmtodit.1.man b/src/utils/tfmtodit/tfmtodit.1.man
index b8590d16e..0f2175374 100644
--- a/src/utils/tfmtodit/tfmtodit.1.man
+++ b/src/utils/tfmtodit/tfmtodit.1.man
@@ -32,6 +32,21 @@ and
.do nr *groff_tfmtodit_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.\" Definitions
diff --git a/src/utils/xtotroff/xtotroff.1.man b/src/utils/xtotroff/xtotroff.1.man
index f598f4896..17fb0db44 100644
--- a/src/utils/xtotroff/xtotroff.1.man
+++ b/src/utils/xtotroff/xtotroff.1.man
@@ -31,6 +31,21 @@ font metrics
.do nr *groff_xtotroff_1_man_C \n[.cp]
.cp 0
.
+.\" Define fallback for groff 1.23's MR macro if the system lacks it.
+.nr do-fallback 0
+.if !\n(.f .nr do-fallback 1 \" mandoc
+.if \n(.g .if !d MR .nr do-fallback 1 \" older groff
+.if !\n(.g .nr do-fallback 1 \" non-groff *roff
+.if \n[do-fallback] \{\
+. de MR
+. ie \\n(.$=1 \
+. I \%\\$1
+. el \
+. IR \%\\$1 (\\$2)\\$3
+. .
+.\}
+.rr do-fallback
+.
.
.\" ====================================================================
.SH Synopsis