diff --git a/net/freeipa-client/files/patch-asn1_asn1c_Makefile.am b/net/freeipa-client/files/patch-asn1_asn1c_Makefile.am
new file mode 100644
index 0000000..d507328
--- /dev/null
+++ b/net/freeipa-client/files/patch-asn1_asn1c_Makefile.am
@@ -0,0 +1,11 @@
+--- asn1/asn1c/Makefile.am.orig	2021-11-25 17:34:42 UTC
++++ asn1/asn1c/Makefile.am
+@@ -70,7 +70,7 @@ libasn1c_la_SOURCES =		\
+ 
+ EXTRA_DIST = ipa.asn1
+ 
+-AM_CPPFLAGS = -I$(top_srcdir)/util
++AM_CPPFLAGS = -I$(top_srcdir)/util -D_GNU_SOURCE
+ 
+ noinst_LTLIBRARIES=libasn1c.la
+