WX_VERSION controls the output of `wx-config --version`. If this contains
characters it confuses the WX_CONFIG_CHECK macro from wxwin.m4. WX_VERSION
doesn't seem to affect the build or install, so try dropping -gtk3 from it.
Package-Manager: portage-2.2.27
IUSE="+X aqua doc debug gstreamer libnotify opengl sdl tiff webkit"
WXSUBVERSION=${PV}-gtk3 # 3.0.2.0-gtk3
-WXVERSION=${WXSUBVERSION%.*}-gtk3 # 3.0.2-gtk3
+WXVERSION=${WXSUBVERSION%.*} # 3.0.2
WXRELEASE=${WXVERSION%.*}-gtk3 # 3.0-gtk3
WXRELEASE_NODOT=${WXRELEASE//./} # 30-gtk3