Add pkg-config support, remove the need for ldconfig, and fix install…

…ation into a prefix path containing whitespace.

Makefile

@@ -7,9 +7,14 @@ SONAME=libapp.so
 PREFIX=/usr/local
 INCDIR=$(PREFIX)/include/libapp
 LIBDIR=$(PREFIX)/lib
+PKGCONFIGDIR=$(LIBDIR)/pkgconfig
+INSTALL_S = install -s
+LN_SF = ln -sf
 TESTS=apptest listtest
 
 # Main target
+all: $(SONAME) libapp.pc
+
 $(SONAME): $(SONAME).$(VER)
 
 # Dependencies
@@ -23,16 +28,26 @@ $(SONAME).$(VER):	$(OBJS)
 .c.o:
 	$(CC) $(MY_CFLAGS) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
-clean:
-	rm -f $(SONAME).* *.o test/*.o $(TESTS)
-
-install: $(SONAME)
-	install -d $(LIBDIR)
-	install -s $(SONAME).$(VER) $(LIBDIR)
-	install -d $(INCDIR)
-	install -m 644 -t $(INCDIR) $(HEADERS)
+libapp.pc: libapp.pc.in
+	sed \
+		-e 's:@PREFIX@:$(PREFIX):g' \
+		-e 's:@LIBDIR@:$(LIBDIR):g' \
+		-e 's:@INCLUDEDIR@:$(INCDIR):g' \
+		-e 's:@PACKAGE_NAME@:libapp:g' \
+		-e 's:@PACKAGE_VERSION@:$(VER):g' \
+		$< > $@
 
-	@echo "*** Note: you should probably run 'ldconfig'"
+clean:
+	rm -f $(SONAME).* *.o test/*.o *.pc $(TESTS)
+
+install: $(SONAME) libapp.pc
+	install -d '$(LIBDIR)'
+	$(INSTALL_S) -t '$(LIBDIR)' $(SONAME).$(VER)
+	$(LN_SF) $(SONAME).$(VER) '$(LIBDIR)'/$(SONAME)
+	install -d '$(INCDIR)'
+	install -m 644 -t '$(INCDIR)' $(HEADERS)
+	install -d '$(PKGCONFIGDIR)'
+	install -t '$(PKGCONFIGDIR)' libapp.pc
 
 test: $(SONAME) $(TESTS)
 

libapp.pc.in

@@ -0,0 +1,9 @@
+prefix=@PREFIX@
+libdir=@LIBDIR@
+includedir=@INCLUDEDIR@
+
+Name: @PACKAGE_NAME@
+Description: Common routines used by applications
+Version: @PACKAGE_VERSION@
+Libs: '-L${libdir}' -lapp
+Cflags: '-I${includedir}'