Can't compile source code

[tabacman86]

Hi there,
I want to create my own build with my own root PW and custom SSH port (so far so good...)

However, when I'm trying to build I get the following error:
tmplen = strftime (tmpbuf, tmpbufsize, locale_format, &tm); ^~~~~~ cc1: some warnings being treated as errors make[7]: *** [Makefile:1387: libglib_2_0_la-gdate.lo] Error 1 make[7]: *** Waiting for unfinished jobs.... mv -f .deps/libglib_2_0_la-gkeyfile.Tpo .deps/libglib_2_0_la-gkeyfile.Plo make[7]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu/glib/glib' make[6]: *** [Makefile:1934: all-recursive] Error 1 make[6]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu/glib/glib' make[5]: *** [Makefile:953: all] Error 2 make[5]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu/glib/glib' make[4]: *** [Makefile:1046: all-recursive] Error 1 make[4]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu/glib' make[3]: *** [Makefile:770: all] Error 2 make[3]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu/glib' make[2]: *** [Makefile:707: all-recursive] Error 1 make[2]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu' make[1]: *** [Makefile:463: all] Error 2 make[1]: Leaving directory '/home/otabac/Downloads/OpenELEC.tv/build.OpenELEC-Generic.x86_64-8.0-devel/pkg-config-0.29.1/.x86_64-linux-gnu' Makefile:10: recipe for target 'image' failed make: *** [image] Error 2

I'm running Ubuntu 17.10 on a VM with 8GB RAM.

Thanks in advance.