irrlicht: unbreak musl

srcpkgs/irrlicht/template

@@ -1,7 +1,7 @@
 # Template file for 'irrlicht'
 pkgname=irrlicht
 version=1.8.1
-revision=1
+revision=2
 hostmakedepends="unzip pkg-config"
 makedepends="libjpeg-turbo-devel libpng-devel libXcursor-devel libXext-devel MesaLib-devel"
 short_desc="Lightning fast realtime 3D engine"
@@ -16,9 +16,14 @@ pre_build() {
 	for file in COpenGLExtensionHandler.h glext.h glxext.h wglext.h; do
 		$XBPS_FETCH_CMD "http://sourceforge.net/p/irrlicht/code/4600/tree/trunk/source/Irrlicht/${file}?format=raw>${file}"
 	done
+	case "$XBPS_TARGET_MACHINE" in
+		*-musl) # There is no <sys/sysctl.h> in musl libc
+			sed -e "s;<sys/sysctl\.h>;<linux/sysctl.h>;" \
+				-i ${wrksrc}/source/Irrlicht/COSOperator.cpp
+	esac
 }
 do_build() {
-	cd source/Irrlicht
+	cd ${wrksrc}/source/Irrlicht
 	make ${makejobs} NDEBUG=1 sharedlib
 	make ${makejobs} NDEBUG=1
 }