more portable string comparison in Makefile.inc; patch by Edgar Pettijohn
diff --git a/Makefile.inc b/Makefile.inc
index 3c61ffe..bb6ed69 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -4,7 +4,7 @@ CFLAGS += -Werror -Wall -Wstrict-prototypes -Wunused-variable
#CFLAGS += -DGOT_NO_OBJ_CACHE
#CFLAGS += -DGOT_OBJ_CACHE_DEBUG
-.if ${GOT_RELEASE} == "Yes"
+.if "${GOT_RELEASE}" == "Yes"
PREFIX ?= /usr/local
BINDIR ?= ${PREFIX}/bin
LIBEXECDIR ?= ${PREFIX}/libexec