From 7ee191f54c2a830767207fb6563380a87f60ddf0 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Wed, 18 Jun 2025 10:38:10 +0200
Subject: Set build specific variable for zOS

* configure.ac (EXTRA_LIBS_FOR_BUILD): New ac_subst.
* src/Makefile.am (mkheader): Append that var to the rule.
---
 configure.ac    | 11 +++++++++++
 src/Makefile.am |  3 ++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 83a52a4..d26c852 100644
--- a/configure.ac
+++ b/configure.ac
@@ -142,6 +142,17 @@ case "${host}" in
        ;;
 esac
 
+# Set some variables for building build platform helpers.
+case "$build_os" in
+    *zOS*)
+        EXTRA_LIBS_FOR_BUILD=zoslib
+        ;;
+    *)
+        EXTRA_LIBS_FOR_BUILD=
+	;;
+esac
+AC_SUBST(EXTRA_LIBS_FOR_BUILD)
+
 
 if test "$have_w32_system" != yes; then
   gl_THREADLIB_EARLY
diff --git a/src/Makefile.am b/src/Makefile.am
index ecea540..6a3b5e4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -278,7 +278,8 @@ errnos-sym.h: Makefile mkstrtable.awk errnos.in
 
 mkheader$(EXEEXT_FOR_BUILD): mkheader.c Makefile
 	$(CC_FOR_BUILD) $(CFLAGS_FOR_BUILD) $(LDFLAGS_FOR_BUILD) \
-	$(CPPFLAGS_FOR_BUILD) -g -I. -I$(srcdir) -o $@ $(srcdir)/mkheader.c
+	$(CPPFLAGS_FOR_BUILD) -g -I. -I$(srcdir) \
+        -o $@ $(srcdir)/mkheader.c $(EXTRA_LIBS_FOR_BUILD)
 
 parts_of_gpg_error_h = 	 	\
 	gpg-error.h.in  	\
-- 
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