-ifneq ($(wildcard $(LLVMGCCDIR)),)
-PARALLEL_DIRS := $(sort $(filter-out Output/, $(filter-out CVS/, $(wildcard */))))
-else
-PARALLEL_DIRS :=
-all ::
- @echo '********' Warning: Your LLVMGCCDIR is set incorrectly. Double-check
- @echo '********' Warning: llvm/Makefile.config to make sure it matches
- @echo '********' Warning: the directory where the C front-end is installed,
- @echo '********' Warning: and re-run configure if it does not.
+
+ifndef NO_RUNTIME_LIBS
+
+PARALLEL_DIRS := libprofile
+
+# Disable libprofile: a faulty libtool is generated by autoconf which breaks the
+# build on Sparc
+ifeq ($(ARCH), Sparc)
+PARALLEL_DIRS := $(filter-out libprofile, $(PARALLEL_DIRS))
+endif
+
+ifeq ($(TARGET_OS), $(filter $(TARGET_OS), Cygwin MingW Minix))
+PARALLEL_DIRS := $(filter-out libprofile, $(PARALLEL_DIRS))
+endif
+