Need help building GTK3 FF

[geobr]

Hi, I am attempting to build Firefox 24.8.1 (I know it's an old version, but I do have a reason) using GTK3, but I have hit a snag. I've searched all over Google, but to no avail so far. Below is the error I receive, could anyone give me a few pointers? Build environment is a x64 CentOS 7 VM. I am able to build a GTK2 version in this VM without issues. Any help would be appreciated, thanks in advance!

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/home/geobr/ffsrc/widget/gtk2/nsDeviceContextSpecG.cpp: In member function ‘virtual nsresult nsDeviceContextSpecGTK::EndDocument()’:
/home/geobr/ffsrc/widget/gtk2/nsDeviceContextSpecG.cpp:578:79: error: invalid conversion from ‘void (*)(GtkPrintJob*, gpointer, GError*) {aka void (*)(_GtkPrintJob*, void*, _GError*)}’ to ‘GtkPrintJobCompleteFunc {aka void (*)(_GtkPrintJob*, void*, const _GError*)}’ [-fpermissive]
In file included from ../../dist/system_wrappers/gtk/gtkprintjob.h:3:0,
                 from /usr/include/gtk-3.0/unix-print/gtk/gtkunixprint.h:24,
                 from /home/geobr/ffsrc/widget/gtk2/nsDeviceContextSpecG.h:23,
                 from /home/geobr/ffsrc/widget/gtk2/nsDeviceContextSpecG.cpp:18:
/usr/include/gtk-3.0/unix-print/gtk/gtkprintjob.h:96:26: error:   initializing argument 2 of ‘void gtk_print_job_send(GtkPrintJob*, GtkPrintJobCompleteFunc, gpointer, GDestroyNotify)’ [-fpermissive]
make[6]: *** [nsDeviceContextSpecG.o] Error 1

[xunxun1982]

I think you use a gcc compiler newer than 4.6?

So you will come across some compatible issues, you can decrease your gcc edition or add the compiler switch -fpermissive to your compiler flags.

[geobr]

Yes, I'm using GCC 4.7.2 (same as I used with my gtk2 build).

add the compiler switch -fpermissive to your compiler flags.

Would adding this to my .mozconfig work?

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export CFLAGS="-fpermissive"
export CXXFLAGS="-fpermissive"

Sorry for the noob question, but I appreciate the help!