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-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index dccb2aaf..c7b28c52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -792,6 +792,7 @@ if test x"$with_included_zlib" = x"yes"; then
BUILD_ZLIB='$(zlib_OBJS)'
CFLAGS="$CFLAGS -I$srcdir/zlib"
else
+ AC_DEFINE(EXTERNAL_ZLIB, 1, [Define to 1 if using external zlib])
AC_MSG_RESULT(no)
fi