9 files changed, 135 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