LinuxQuestions.org - Firefox Build Problem after upgrade

I have recently upgraded one of my PCs to Slackware 12.1 and it is not possible to build Firefox without the build aborting with an error.

This occurs whether or not the '.mozconfig' file has the line: 'ac_add_options --enable-canvas'.

This is the terminal output:

Quote:

/usr/src/firefox-2.0.0.14-source/mozilla/content/canvas/src/nsCanvasRenderingContext2D.cpp:2808: instantiated from here
../../../dist/include/xpcom/nsAutoPtr.h:505: warning: dereferencing type-punned pointer will break strict-aliasing rules
/usr/src/firefox-2.0.0.14-source/mozilla/content/canvas/src/nsCanvasRenderingContext2D.cpp: At global scope:
/usr/src/firefox-2.0.0.14-source/mozilla/content/canvas/src/nsCanvasRenderingContext2D.cpp:198: warning: 'PRBool FloatValidate(double, double, double)' defined but not used
gmake[5]: *** [nsCanvasRenderingContext2D.o] Error 1
gmake[5]: Leaving directory `/usr/src/firefox-2.0.0.14-source/mozilla/ffobjs/content/canvas/src'
gmake[4]: *** [libs] Error 2
gmake[4]: Leaving directory `/usr/src/firefox-2.0.0.14-source/mozilla/ffobjs/content/canvas'
gmake[3]: *** [libs] Error 2
gmake[3]: Leaving directory `/usr/src/firefox-2.0.0.14-source/mozilla/ffobjs/content'
gmake[2]: *** [tier_9] Error 2
gmake[2]: Leaving directory `/usr/src/firefox-2.0.0.14-source/mozilla/ffobjs'
gmake[1]: *** [default] Error 2
gmake[1]: Leaving directory `/usr/src/firefox-2.0.0.14-source/mozilla/ffobjs'
gmake: *** [build] Error 2
root@kazmo:/usr/src/firefox-2.0.0.14-source/mozilla#

This same Firefox source and 'mozconfig' worked perfectly to build Firefox before the upgrade.

I guess that i probably have a library or something missing, maybe to do with X11?

Any clues would be helpful.

Many thanks,

Bill.