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-rw-r--r--hints/os390.sh3
1 files changed, 3 insertions, 0 deletions
diff --git a/hints/os390.sh b/hints/os390.sh
index 6d1538fc54..8995d8c353 100644
--- a/hints/os390.sh
+++ b/hints/os390.sh
@@ -35,6 +35,9 @@ esac
# "unicode literals" to be enabled
def_os390_cflags='-qlanglvl=extc1x';
+# For #ifdefs in code
+def_os390_defs="-DOS390 -DZOS";
+
# Turn on POSIX compatibility modes
# https://www.ibm.com/support/knowledgecenter/SSLTBW_2.4.0/com.ibm.zos.v2r4.bpxbd00/ftms.htm
def_os390_defs="$def_os390_defs -D_ALL_SOURCE";