libxml2: fixed build if python and python3 are installed

libxml2/.signature

@@ -1,5 +1,5 @@
 untrusted comment: verify with /etc/ports/opt.pub
-RWSE3ohX2g5d/T/s/1D/Zs3x/eY4A26aor+hYID2NBFupzEWIyoM9BCvjU9oE/weDmFnCr3bHOUL6uSrtdUBaDkimGEjRLZOyQI=
-SHA256 (Pkgfile) = d1404ce02908ed3e5596cf9ee81011d46e11e7c411b1d225eb3cc099bd0bb3c8
+RWSE3ohX2g5d/ShJBGesQaqXj/okbyCCCS5+RJSVbRYwbCveUOkkHH5yKNbksmurps5tAyiqpAhFSBgQzAtlOkl3h9aTA/8RPwY=
+SHA256 (Pkgfile) = f6c2c12767a575663f94a61360d646e23b95ad1c0470dbbf10b4be359f6ca1c3
 SHA256 (.footprint) = 10c73f16d3428d4a71c5165d3d8a350fa37f371824d6e7cb429c4fa53510e2f2
 SHA256 (libxml2-2.12.5.tar.xz) = a972796696afd38073e0f59c283c3a2f5a560b5268b4babc391b286166526b21

libxml2/Pkgfile

@@ -5,18 +5,28 @@
 
 name=libxml2
 version=2.12.5
-release=1
+release=2
 source=(https://download.gnome.org/sources/libxml2/${version:0:4}/$name-$version.tar.xz)
 
 build() {
 	cd $name-$version
 
+	export PYTHON=/usr/bin/python3
 	./configure \
 		--prefix=/usr \
 		--sysconfdir=/etc
-
 	make
 	make DESTDIR=$PKG install
 
+	if prt-get isinst python
+	then
+		export PYTHON=/usr/bin/python
+		./configure \
+			--prefix=/usr \
+			--sysconfdir=/etc
+		make
+		make DESTDIR=$PKG install
+	fi
+
 	rm -r $PKG/usr/share/{doc,gtk-doc}
 }