1 files changed, 1 insertions, 1 deletions
diff --git a/configure b/configure
index 1fa12db..239f3e8 100755
--- a/configure
+++ b/configure
@@ -122,7 +122,7 @@ tryldflag () {
 
 CC_AUTO=
 CFLAGS_AUTO="$CFLAGS"
-CPPFLAGS_AUTO="-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -O2 $CPPFLAGS"
+CPPFLAGS_AUTO="-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -O2 $CPPFLAGS -fsigned-char"
 LDFLAGS_AUTO="$LDFLAGS"
 LDFLAGS_SHARED=-shared
 LDFLAGS_NOSHARED=