python3-pybind11: add "system" headers, cmake and pkg-config configs

srcpkgs/python3-pybind11/template

@@ -1,7 +1,7 @@
 # Template file for 'python3-pybind11'
 pkgname=python3-pybind11
 version=2.11.1
-revision=1
+revision=2
 build_style=python3-module
 hostmakedepends="cmake python3-setuptools
  python3-pytest python3-sphinx_rtd_theme python3-breathe"
@@ -45,7 +45,19 @@ post_install() {
 	vlicense LICENSE
 
 	# Copy the man page, but make it section 7
-	_manpage=docs/.build/man/pybind11.1
+	local _manpage=docs/.build/man/pybind11.1
 	vsed -i ${_manpage} -e '/^\.TH/ s/"1"/"7"/'
 	vman ${_manpage} pybind11.7
+
+	# Include links for a "system" installation
+	local _pybind11="${DESTDIR}/${py3_sitelib}/pybind11"
+	local _tgt
+
+	for _tgt in include share/{cmake,pkgconfig}; do
+		vmkdir "usr/${_tgt}"
+	done
+
+	for _tgt in {include,share/cmake}/pybind11 share/pkgconfig/pybind11.pc; do
+		ln -Trs "${_pybind11}/${_tgt}" "${DESTDIR}/usr/${_tgt}"
+	done
 }