remove some differences with the macosx version.

git-svn-id: http://root.cern.ch/svn/root/trunk@20663 27541ba8-7e3a-0410-8455-c3a389f83636

config/Makefile.macosx64

@@ -89,7 +89,7 @@ F77LIBS       =
 endif
 endif
 else
-F77           = g77
+F77          := g77
 F77LIBS       =
 endif
 F77FLAGS      = -m64
@@ -113,7 +113,7 @@ INSTALLDATA  := /bin/cp -pPR
 
 # Extras
 ifeq ($(NEEDFINK),yes)
-FINK_CXXFLAGS = $(shell [ -d $(FINK_DIR)/include ] && echo -I$(FINK_DIR)/include)
-FINK_CFLAGS   = $(shell [ -d $(FINK_DIR)/include ] && echo -I$(FINK_DIR)/include)
-FINK_LDFLAGS  = $(shell [ -d $(FINK_DIR)/lib ] && echo -L$(FINK_DIR)/lib)
+FINK_CXXFLAGS := $(shell [ -d $(FINK_DIR)/include ] && echo -I$(FINK_DIR)/include)
+FINK_CFLAGS   := $(shell [ -d $(FINK_DIR)/include ] && echo -I$(FINK_DIR)/include)
+FINK_LDFLAGS  := $(shell [ -d $(FINK_DIR)/lib ] && echo -L$(FINK_DIR)/lib)
 endif