mercurial: explicit dependency on cmd:python2.

otherwise HaikuPorter resolves the "< 3" with specific version requirement "== 2.7.12".

dev-vcs/mercurial/mercurial-3.2.1.recipe

@@ -4,7 +4,7 @@ tool."
 HOMEPAGE="http://mercurial.selenic.com/"
 COPYRIGHT="2005-2014 Matt Mackall et al."
 LICENSE="GNU GPL v2"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="http://mercurial.selenic.com/release/mercurial-$portVersion.tar.gz"
 CHECKSUM_SHA256="26418276fbc36850782f1f4feb30da4a83800b48493082985c4d3ac29ad0ca0f"
 PATCHES="mercurial-3.2.1.patch"
@@ -16,16 +16,18 @@ PROVIDES="
 	cmd:hg = $portVersion compat >= 3
 	"
 REQUIRES="
+	haiku
 	haiku_devel
-	cmd:python < 3
+	cmd:python2
 	cmd:nano
+	lib:libpython2.7
 	"
 
 BUILD_REQUIRES="
 	haiku_devel
 	"
 BUILD_PREREQUIRES="
-	cmd:python < 3
+	cmd:python2
 	cmd:gcc
 	cmd:gettext
 	cmd:ld
@@ -35,12 +37,12 @@ BUILD_PREREQUIRES="
 
 BUILD()
 {
-	$portPackageLinksDir/cmd~python/bin/python setup.py build --force
+	$portPackageLinksDir/cmd~python2/bin/python2 setup.py build --force
 }
 
 INSTALL()
 {
-	$portPackageLinksDir/cmd~python/bin/python setup.py install \
+	$portPackageLinksDir/cmd~python2/bin/python2 setup.py install \
 		--prefix="$prefix" \
 		--force
 }
@@ -48,5 +50,5 @@ INSTALL()
 TEST()
 {
 	cd tests
-	python run-tests.py
+	python2 run-tests.py
 }