Build error for 2.7.16

[Daniel Johnson]

I am trying to build 2.7.16 on a Gentoo box, and the build is dying with
the following error:

i686-pc-linux-gnu-g++ -c -O3 -march=pentium4 -funroll-loops
-fomit-frame-pointer -pipe -DHAVE_CONFIG_H  -DNDEBUG
-DSTRING_UTILS_INLINED -I./include -I./out -I../flower/include
-I../flower/./out -I../flower/include  -O3 -march=pentium4
-funroll-loops -fomit-frame-pointer -pipe -O2 -finline-functions -g
-pipe -pthread -I/usr/include/freetype2   -I/usr/include/pango-1.0
-I/usr/include/freetype2 -I/usr/include/glib-2.0
-I/usr/lib/glib-2.0/include   -Wno-pmf-conversions -W -Wall -Wconversion
-o out/font-config-scheme.o font-config-scheme.cc
font-config-scheme.cc: In function `void display_fontset(FcFontSet*)':
font-config-scheme.cc:32: error: invalid conversion from `FcChar8*' to
`const
   char*'
make[1]: *** [out/font-config-scheme.o] Error 1
make[1]: Leaving directory
`/var/tmp/portage/lilypond-2.7.16/work/lilypond-2.7.16/lily'
make: *** [all] Error 2

Any clues on how to proceed?

--Daniel