implement out of source builds

Makefile

@@ -1,26 +1,23 @@
-CC=gcc
 ifeq ($(APXS_PATH),)
 APXS_PATH=/usr/sbin/apxs
 endif
 
 MY_LDFLAGS=-lcurl -lyajl
-
 # Note that gcc flags are passed through apxs, so preface with -Wc
 MY_CFLAGS=-Wc,-I. -Wc,-Wall
+SRCS=mod_auth_browserid.c
 
 .SUFFIXES: .c .o .la
-.c.la:
-	$(APXS_PATH) $(MY_LDFLAGS) $(MY_CFLAGS) -c $<
-.c.o:
-	$(CC) -c $<
 
-all:  mod_auth_browserid.la
+build/.libs/mod_auth_browserid.so: $(SRCS)
+	@mkdir -p build/
+	@cd build && for file in $^ ; do ln -sf ../$$file . ; done
+	@cd build && $(APXS_PATH) $(MY_LDFLAGS) $(MY_CFLAGS) -c $^
 
-install: mod_auth_browserid.la
-	@echo "-"$*"-" "-"$?"-" "-"$%"-" "-"$@"-" "-"$<"-"
-	$(APXS_PATH) -i $?
+all:  build/.libs/mod_auth_browserid.so
+
+install: build/.libs/mod_auth_browserid.so
+	$(APXS_PATH) -i build/mod_auth_browserid.c
 
 clean:
-	-rm -f *.o *.lo *.la *.slo
-	-rm -rf .libs
-
+	-rm -rf build