View source for ktwebkit 5.7.1 fails to compile on gentoo


== problem ==
 ktwebkit version 5.7.1 fails to compile on gentoo


== error messages ==

ruby related error messages

similar problem found [https://forums.gentoo.org/viewtopic-t-1043412-start-0.html here]


=== Example ===

localhost ~ # '''emerge --oneshot --quiet =dev-qt/qtwebkit-5.7.1'''
<br>...

<br>>>> Verifying ebuild manifests
<br>>>> Emerging (1 of 1) dev-qt/qtwebkit-5.7.1::gentoo
<br>>>> Failed to emerge dev-qt/qtwebkit-5.7.1, Log file:
<br>>>>  '/var/tmp/portage/dev-qt/qtwebkit-5.7.1/temp/build.log'

<br>(error snippet)...
<br>make[2]: Entering directory '/var/tmp/portage/dev-qt/qtwebkit-5.7.1/work/qtwebkit-opensource-src-5.7.1/Source/JavaScriptCore'
<br>ruby /var/tmp/portage/dev-qt/qtwebkit-5.7.1/work/qtwebkit-opensource-src-5.7.1/Source/JavaScriptCore/offlineasm/generate_offset_extractor.rb llint/LowLevelInterpreter.asm LLIntDesiredOffsets.h
<br>/usr/lib64/ruby/2.0.0/rubygems.rb:15:in `require': cannot load such file -- rubygems/compatibility (LoadError)        
<br>     from /usr/lib64/ruby/2.0.0/rubygems.rb:15:in `<top (required)>'
<br>        from <internal:gem_prelude>:1:in `require'
<br>        from <internal:gem_prelude>:1:in `<compiled>'
<br>make[2]: *** [Makefile.LLIntOffsetsExtractor:487: LLIntDesiredOffsets.h] Error 1
<br>make[2]: Leaving directory '/var/tmp/portage/dev-qt/qtwebkit-5.7.1/work/qtwebkit-opensource-src-5.7.1/Source/JavaScriptCore'
<br>make[1]: *** [Makefile.JavaScriptCore:42: sub-LLIntOffsetsExtractor-pro-make_first-ordered] Error 2
<br>make[1]: Leaving directory '/var/tmp/portage/dev-qt/qtwebkit-5.7.1/work/qtwebkit-opensource-src-5.7.1/Source/JavaScriptCore'make: *** [Makefile:93: sub-Source-JavaScriptCore-JavaScriptCore-pro-make_first-ordered] Error 2
<br>* ERROR: dev-qt/qtwebkit-5.7.1::gentoo failed (compile phase): *   emake failed * 
<br>...


== solution ==

update ruby profile to one more recent

=== Example: ===

<br>localhost ~ # '''eselect ruby list'''
<br>Available Ruby profiles:  
<br>    [1]   ruby20 *  
<br>    [2]   ruby21 (with Rubygems)
<br>    [3]   ruby22 (with Rubygems)  
<br>    [4]   ruby23 (with Rubygems)

<br>localhost  ~ # '''eselect ruby set 4'''

<br>Successfully switched to profile:  ruby23

<br>localhost  ~ # '''emerge --oneshot --quiet =dev-qt/qtwebkit-5.7.1'''

<br>>>> Verifying ebuild manifests
<br>>>> Emerging (1 of 1) dev-qt/qtwebkit-5.7.1::gentoo
<br>>>> Installing (1 of 1) dev-qt/qtwebkit-5.7.1::gentoo

<br>!!! existing preserved libs found

'''Success!'''