Makefile: configure for libraries properly

.gitignore

@@ -1,3 +1,4 @@
-hairtunes
 shairport
 *.o
+config.mk
+config.h

Makefile

@@ -1,6 +1,20 @@
-SRCS := shairport.c rtsp.c mdns.c audio.c common.c rtp.c player.c alac.c $(wildcard audio_*.c)
+ifeq ($(wildcard config.mk),)
+$(warning config.mk does not exist, configuring.)
+config.mk:
+	sh ./configure
+	$(MAKE) shairport
+endif
 
-LIBS := -lcrypto -lm -lao -lpthread
+-include config.mk
+
+SRCS := shairport.c rtsp.c mdns.c common.c rtp.c player.c alac.c audio.c audio_dummy.c
+
+ifdef CONFIG_AO
+SRCS += audio_ao.c
+endif
 
 shairport: $(SRCS)
-	gcc -ggdb -Wall -Wno-unused-value $(SRCS) $(LIBS) -o shairport
+	$(CC) $(CFLAGS) $(SRCS) $(LDFLAGS) -o shairport
+
+clean:
+	rm shairport

config.h

@@ -1 +0,0 @@
-#define CONFIG_AO

configure

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+echo Configuring Shairport
+
+rm -f config.mk config.h
+
+LDFLAGS+=" -lm -lpthread"
+
+if pkg-config openssl 2>/dev/null; then
+    CFLAGS+=" `pkg-config --cflags openssl`"
+    LDFLAGS+=" `pkg-config --libs openssl`"
+else
+    echo Guessing OpenSSL linker flags
+    LDFLAGS+=" -lssl -lcrypto"
+fi
+
+if pkg-config ao 2>/dev/null; then
+    CFLAGS+=" `pkg-config --cflags ao`"
+    LDFLAGS+=" `pkg-config --libs ao`"
+    echo "#define CONFIG_AO" >> config.h
+    echo "CONFIG_AO=yes" >> config.mk
+    echo libao found
+else
+    echo libao not found
+fi
+
+echo "CFLAGS+=${CFLAGS}" >> config.mk
+echo "LDFLAGS+=${LDFLAGS}" >> config.mk
+
+echo CFLAGS: ${CFLAGS}
+echo LDFLAGS: ${LDFLAGS}
+
+echo Configure done