diff --git a/deps/gtkmm/gtkmm.SlackBuild b/deps/gtkmm/gtkmm.SlackBuild
index 68ba46d..ede1bac 100644
--- a/deps/gtkmm/gtkmm.SlackBuild
+++ b/deps/gtkmm/gtkmm.SlackBuild
@@ -42,7 +42,7 @@ wget -c http://download.gnome.org/sources/$PRGNAM/2.24/$PRGNAM-$VERSION.tar.xz
 
 NUMJOBS=${NUMJOBS:-" -j8 "}
 
-CWD=$(pwd)		
+CWD=$(pwd)
 TMP=${TMP:-/tmp/msb}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
@@ -77,7 +77,7 @@ find . \
  -exec chmod 644 {} \;
 
 CFLAGS="$SLKCFLAGS" \
-CXXFLAGS="$SLKCFLAGS" \
+CXXFLAGS="$SLKCFLAGS -std=c++11" \
   ./configure \
   --prefix=/usr \
   --libdir=/usr/lib${LIBDIRSUFFIX} \