diff --git a/misc/projectM/projectM.SlackBuild b/misc/projectM/projectM.SlackBuild
index 994a7cbd7d..9d968995a7 100644
--- a/misc/projectM/projectM.SlackBuild
+++ b/misc/projectM/projectM.SlackBuild
@@ -24,7 +24,7 @@
 
 PRGNAM=projectM
 VERSION=${VERSION:-2.1.0}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -78,7 +78,7 @@ mkdir -p build
 cd build
   cmake \
     -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
-    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS -lglut -lGL" \
+    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS -lglut -lGL -std=c++11" \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DLIB_INSTALL_DIR=/usr/lib${LIBDIRSUFFIX} \
     -DLIB_SUFFIX=${LIBDIRSUFFIX} \