adjust recipes to use python 3.6, bump revisions.

dev-python/sip/sip-4.19.1.recipe

@@ -6,11 +6,12 @@ module provides support functions to the automatically generated code."
 HOMEPAGE="https://www.riverbankcomputing.com/software/sip/"
 COPYRIGHT="2015 Riverbank Computing Limited"
 LICENSE="GNU GPL v3"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="http://sourceforge.net/projects/pyqt/files/sip/sip-$portVersion/sip-$portVersion.tar.gz"
 CHECKSUM_SHA256="501852b8325349031b769d1c03d6eab04f7b9b97f790ec79f3d3d04bf065d83e"
 SOURCE_DIR="sip-$portVersion"
 PATCHES="sip-$portVersion.patch"
+PYTHON3_VERSION="3.6"
 
 ARCHITECTURES="x86 x86_gcc2 x86_64"
 
@@ -37,7 +38,7 @@ PROVIDES_python3="
 	"
 REQUIRES_python3="
 	haiku
-	cmd:python3
+	cmd:python$PYTHON3_VERSION
 	"
 REPLACES_python3="
 	python3_sip
@@ -48,7 +49,7 @@ BUILD_REQUIRES="
 	"
 BUILD_PREREQUIRES="
 	cmd:python2
-	cmd:python3
+	cmd:python$PYTHON3_VERSION
 	cmd:gcc
 	cmd:make
 	"
@@ -76,7 +77,7 @@ BUILD()
 	mkdir -p ../build3 && cd ../build3
 
 	# GENERIC: all python_setuptools-based installs need this
-	python=$portPackageLinksDir/cmd~python3/bin/python3
+	python=$portPackageLinksDir/cmd~python$PYTHON3_VERSION/bin/python3
 	pythonVersion=$($python --version 2>&1 | sed 's/Python //' | head -c3)
 	installLocation=$prefix/lib/python$pythonVersion/vendor-packages/
 	export PYTHONPATH=$installLocation:$OLDPYTHONPATH