diff --git a/gcc-4.9/build.sh b/gcc-4.9/build.sh
index f51cb6d0a..331386d2d 100644
--- a/gcc-4.9/build.sh
+++ b/gcc-4.9/build.sh
@@ -1,10 +1,21 @@
-./configure \
-    --prefix=$PREFIX \
-    --with-gmp=$PREFIX \
-    --with-mpfr=$PREFIX \
-    --with-mpc=$PREFIX \
-    --with-isl=$PREFIX \
-    --with-cloog=$PREFIX
+if [ `uname` == Darwin ]; then
+    ./configure \
+        --prefix=$PREFIX \
+        --with-gmp=$PREFIX \
+        --with-mpfr=$PREFIX \
+        --with-mpc=$PREFIX \
+        --with-isl=$PREFIX \
+        --with-cloog=$PREFIX \
+        --disable-multilib
+else
+    ./configure \
+        --prefix=$PREFIX \
+        --with-gmp=$PREFIX \
+        --with-mpfr=$PREFIX \
+        --with-mpc=$PREFIX \
+        --with-isl=$PREFIX \
+        --with-cloog=$PREFIX
+fi
 
 make
 make install