diff --git a/ghc-rpm-macros.spec b/ghc-rpm-macros.spec
index 79fb939..451494c 100644
--- a/ghc-rpm-macros.spec
+++ b/ghc-rpm-macros.spec
@@ -6,7 +6,7 @@
 #%%global without_hscolour 1
 
 Name:           ghc-rpm-macros
-Version:        1.2.17
+Version:        1.2.18
 Release:        1%{?dist}
 Summary:        RPM macros for building packages for GHC
 
@@ -102,6 +102,10 @@ EOF
 
 
 %changelog
+* Mon Jan 19 2015 Jens Petersen <petersen@redhat.com> - 1.2.18-1
+- exclude -Wall from CFLAGS to prevent Cabal configure warning with ghc-7.6
+  (#1175667)
+
 * Fri Nov 14 2014 Jens Petersen <petersen@redhat.com> - 1.2.17-1
 - split ghc.attr into ghc_lib.attr and ghc_bin.attr for finer grained handling
 - require ghc-compiler for ghc_version
diff --git a/macros.ghc b/macros.ghc
index aa0e19a..1e45565 100644
--- a/macros.ghc
+++ b/macros.ghc
@@ -23,7 +23,7 @@ fi
 %ghc_check_bootstrap\
 CFLAGS="${CFLAGS:-%optflags}"; export CFLAGS\
 LDFLAGS="${LDFLAGS:-%__global_ldflags}"; export LDFLAGS\
-%cabal configure --prefix=%{_prefix} --libdir=%{_libdir} --docdir=%{?_pkgdocdir}%{!?_pkgdocdir:%{_docdir}/%{name}-%{version}} --libsubdir='$compiler/$pkgid' --datasubdir='$pkgid' --ghc %{!?ghc_without_dynamic:--enable-executable-dynamic} %{?with_tests:--enable-tests} --ghc-options="$(echo ' '$CFLAGS | sed -e 's/ / -optc/g') $(echo ' '$LDFLAGS | sed -e 's/ / -optl/g')" %{?cabal_configure_options} $cabal_configure_extra_options
+%cabal configure --prefix=%{_prefix} --libdir=%{_libdir} --docdir=%{?_pkgdocdir}%{!?_pkgdocdir:%{_docdir}/%{name}-%{version}} --libsubdir='$compiler/$pkgid' --datasubdir='$pkgid' --ghc %{!?ghc_without_dynamic:--enable-executable-dynamic} %{?with_tests:--enable-tests} --ghc-options="$(echo ' '$CFLAGS | sed -e 's/-Wall -Werror=format-security //' -e 's/ / -optc/g') $(echo ' '$LDFLAGS | sed -e 's/ / -optl/g')" %{?cabal_configure_options} $cabal_configure_extra_options
 
 # install
 %cabal_install %cabal copy --destdir=%{buildroot} -v