build: add support for pkg-config

Makefile.am

@@ -267,6 +267,11 @@ libuv_la_LIBADD = uv-dtrace.lo
 CLEANFILES += src/unix/uv-dtrace.o src/unix/uv-dtrace.lo
 endif
 
+if HAVE_PKG_CONFIG
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = @PACKAGE_NAME@.pc
+endif
+
 SUFFIXES = .d
 
 include/uv-dtrace.h: src/unix/uv-dtrace.d

configure.ac

@@ -45,6 +45,12 @@ AM_CONDITIONAL([NETBSD],  [AS_CASE([$host_os], [netbsd*],  [true], [false])])
 AM_CONDITIONAL([OPENBSD], [AS_CASE([$host_os], [openbsd*], [true], [false])])
 AM_CONDITIONAL([SUNOS],   [AS_CASE([$host_os], [solaris*], [true], [false])])
 AM_CONDITIONAL([WINNT],   [AS_CASE([$host_os], [mingw*],   [true], [false])])
+PKG_PROG_PKG_CONFIG([0.20])
+AM_CONDITIONAL([HAVE_PKG_CONFIG], [test "x$PKG_CONFIG" != "x"])
+AC_SUBST(HAVE_PKG_CONFIG)
 PANDORA_ENABLE_DTRACE
+AS_IF([test "x$PKG_CONFIG" != "x"], [
+	AC_CONFIG_FILES([libuv.pc])
+])
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT

libuv.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: @PACKAGE_NAME@
+Version: @PACKAGE_VERSION@
+Description: multi-platform support library with a focus on asynchronous I/O.
+
+Libs: -L${libdir} -luv
+Cflags: -I${includedir}