[build] check xcode command line tools version >= 6

future-proof version check for BLAS libraries on OS X
fix #3092

diff --git a/Makefile b/Makefile
index a911133..5fb6394 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -354,8 +354,9 @@ else
                # OS X packages atlas as the vecLib framework
                LIBRARIES += cblas
                # 10.10 has accelerate while 10.9 has veclib
-               XCODE_CLT_VER := $(shell pkgutil --pkg-info=com.apple.pkg.CLTools_Executables | grep -o 'version: 6')
-               ifneq (,$(findstring version: 6,$(XCODE_CLT_VER)))
+               XCODE_CLT_VER := $(shell pkgutil --pkg-info=com.apple.pkg.CLTools_Executables | grep 'version' | sed 's/[^0-9]*\([0-9]\).*/\1/')
+               XCODE_CLT_GEQ_6 := $(shell [ $(XCODE_CLT_VER) -gt 5 ] && echo 1)
+               ifeq ($(XCODE_CLT_GEQ_6), 1)
                        BLAS_INCLUDE ?= /System/Library/Frameworks/Accelerate.framework/Versions/Current/Frameworks/vecLib.framework/Headers/
                        LDFLAGS += -framework Accelerate
                else