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-rw-r--r--rbutil/libtools.make3
1 files changed, 3 insertions, 0 deletions
diff --git a/rbutil/libtools.make b/rbutil/libtools.make
index f9affdd9d4..dadc1a0545 100644
--- a/rbutil/libtools.make
+++ b/rbutil/libtools.make
@@ -75,6 +75,9 @@ ifeq ($(findstring APPLE,$(CPPDEFINES)),APPLE)
# that to determine if we need to set arch and isysroot.
ifeq ($(findstring __clang__,$(CPPDEFINES)),__clang__)
GCCFLAGS += -mmacosx-version-min=10.5
+ifneq ($(ISYSROOT),)
+GCCFLAGS += -isysroot $(ISYSROOT)
+endif
else
# when building libs for OS X 10.4+ build for both i386 and ppc at the same time.
# This creates fat objects, and ar can only create the archive but not operate