Improve Makefile.

FossilOrigin-Name: f069ee6cec63463ffd11997190ca3337b2653b76bf77d68e40f146c8c1ebb049

Makefile

@@ -12,7 +12,8 @@ SRCS = PGConnection.m				\
 HEADERS = ${SRCS:.m=.h}	\
 	  ObjPgSQL.h
 
-CPPFLAGS += -Wall -Iexceptions -I.
+CPPFLAGS += -Iexceptions -I.
+OBJCFLAGS += -Werror
 LIBS += -lpq
 
 prefix ?= /usr/local
@@ -27,10 +28,11 @@ LIB_FILE = ${LIB_PREFIX}${LIB}${LIB_SUFFIX}
 
 all:
 	@objfw-compile				\
-		--lib 0.0		\
+		--lib ${LIB_MAJOR}.${LIB_MINOR}	\
 		-o objpgsql			\
 		--builddir build		\
 		${CPPFLAGS}			\
+		${OBJCFLAGS}			\
 		${LIBS}				\
 		${SRCS}