diff --git a/build.sh b/build.sh
index 83f3a29..4441832 100755
--- a/build.sh
+++ b/build.sh
@@ -151,6 +151,7 @@ patch -p0 < $PATCH_DIR/cctools-ld64-1.patch
 patch -p0 < $PATCH_DIR/cctools-ld64-2.patch
 patch -p1 < $PATCH_DIR/cctools-ld64-linux-ncpus.patch
 patch -p1 < $PATCH_DIR/cctools-ld64-qsort_r.patch
+patch -p1 < $PATCH_DIR/cctools-ld64-gcc6-build-fix.patch
 echo ""
 CONFFLAGS="--prefix=$TARGET_DIR --target=x86_64-apple-$TARGET "
 CONFFLAGS+="--disable-clang-as "
diff --git a/patches/cctools-ld64-gcc6-build-fix.patch b/patches/cctools-ld64-gcc6-build-fix.patch
new file mode 100644
index 0000000..6ffb00e
--- /dev/null
+++ b/patches/cctools-ld64-gcc6-build-fix.patch
@@ -0,0 +1,12 @@
+diff --git cctools/ld64/src/ld/code-sign-blobs/memutils.h cctools/ld64/src/ld/code-sign-blobs/memutils.h
+index 6b8697c..7059669 100644
+--- cctools/ld64/src/ld/code-sign-blobs/memutils.h
++++ cctools/ld64/src/ld/code-sign-blobs/memutils.h
+@@ -31,6 +31,7 @@
+ //#include <security_utilities/utilities.h>
+ #include <sys/types.h>
+ #include <stdlib.h>
++#include <stddef.h> // ld64-port
+ #include <algorithm>
+ 
+ #ifdef __GLIBCXX__ // ld64-port