Makefile install works even when pkg-config is missing
diff --git a/Makefile b/Makefile
index 932c49a..7dfa84e 100644
--- a/Makefile
+++ b/Makefile
@@ -281,6 +281,9 @@
 PKGCFGDIR = $(LIBDATADIR)/pkgconfig
 else
 PKGCFGDIR ?= $(LIBDATADIR)/pkgconfig
+ifeq ($(PKGCFGDIR),)
+PKGCFGDIR = $(LIBDATADIR)/pkgconfig
+endif
 endif
 
 API_MAJOR=$(shell echo `grep -e CS_API_MAJOR include/capstone/capstone.h | grep -v = | awk '{print $$3}'` | awk '{print $$1}')