diff --git a/kdelibs3.spec b/kdelibs3.spec
index 8b225e5..a6fbbda 100644
--- a/kdelibs3.spec
+++ b/kdelibs3.spec
@@ -315,6 +315,8 @@ fi
 export DO_NOT_COMPILE="libkscreensaver"
 %endif
 
+# drop the extra -Werror= flags for C, they break the configure script
+export CFLAGS="%{optflags}"
 export CXXFLAGS="%{optflags} -Wno-deprecated-declarations -Wno-narrowing -std=gnu++98"
 
 %configure \
@@ -619,6 +621,7 @@ touch --no-create %{_datadir}/icons/crystalsvg 2> /dev/null || :
 %changelog
 * Sat Dec 03 2016 Rex Dieter <rdieter@fedoraproject.org> - 3.5.10-78
 - rebuild (jasper)
+- drop the extra -Werror= flags for C, they break the configure script
 
 * Wed Sep 28 2016 Kevin Kofler <Kevin@tigcc.ticalc.org> - 3.5.10-77
 - backport CUPS 2.2 build fix from Trinity / Slávek Banko