Add a libstrongswan-dev debian package with development headers

packages/strongswan/debian/control

@@ -34,8 +34,16 @@ Description: strongSwan plugin to interact with NetworkManager
 
 Package: libstrongswan
 Architecture: any
-Depends: ${shlibs:Depends}
+Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: strongSwan utility and crypto library
  libstrongswan is the underlying library of charon and other strongSwan
  components. It is built in a modular way and is extendable through various
  plugins.
+
+Package: libstrongswan-dev
+Architecture: any
+Priority: optional
+Depends: ${misc:Depends}, libstrongswan (=${binary:Version})
+Section: devel
+Description: strongSwan development headers
+ C header files to develop with libstrongswan.

packages/strongswan/debian/libstrongswan-dev.install

@@ -0,0 +1,2 @@
+usr/lib/strongswan/include/config.h			usr/lib/strongswan/include/
+usr/include/strongswan/*					usr/include/strongswan/

packages/strongswan/debian/rules

@@ -13,7 +13,8 @@ CONFIGURE_ARGS = \
 	--enable-farp --enable-attr-sql --enable-dhcp --enable-openssl --enable-agent \
 	--enable-pkcs11 --enable-ctr --enable-ccm --enable-gcm --enable-addrblock \
 	--enable-nm  --disable-hmac --with-capabilities=libcap \
-	--with-ipsecdir=/usr/lib/strongswan --with-ipseclibdir=/usr/lib/strongswan
+	--with-ipsecdir=/usr/lib/strongswan --with-ipseclibdir=/usr/lib/strongswan \
+	--with-dev-headers=/usr/include/strongswan
 
 ifeq (,$(filter noopt,$(DEB_BUILD_OPTIONS)))
 	CFLAGS += -O2