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-rw-r--r--m4/libevent_openssl.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/m4/libevent_openssl.m4 b/m4/libevent_openssl.m4
index 7b458134..19811981 100644
--- a/m4/libevent_openssl.m4
+++ b/m4/libevent_openssl.m4
@@ -40,7 +40,7 @@ case "$enable_openssl" in
;;
esac
CPPFLAGS_SAVE=$CPPFLAGS
- CPPFLAGS+=$OPENSSL_INCS
+ CPPFLAGS="$CPPFLAGS $OPENSSL_INCS"
AC_CHECK_HEADERS([openssl/ssl.h], [], [have_openssl=no])
CPPFLAGS=$CPPFLAGS_SAVE
AC_SUBST(OPENSSL_INCS)