Since glib-2.16 the function get is not defined.
(gentoo bug: https://bugs.gentoo.org/show_bug.cgi?id=247631)

make -j4
make all-recursive
make[1]: Entering directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7'
Making all in gnu
make[2]: Entering directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7/gnu'
GEN c++defs.h
GEN alloca.h
GEN configmake.h
GEN arg-nonnull.h
GEN warn-on-use.h
GEN langinfo.h
GEN stdio.h
GEN string.h
GEN stdlib.h
GEN time.h
GEN unistd.h
GEN wchar.h
GEN wctype.h
make all-recursive
make[3]: Entering directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7/gnu'
make[4]: Entering directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7/gnu'
CC c-ctype.o
CC localcharset.o
CC xstrndup.o
CC exitfail.o
In file included from localcharset.c:30:0:
./stdio.h:434:1: error: ‘gets’ undeclared here (not in a function)
CC argmatch.o
CC asnprintf.o
CC basename.o
In file included from argmatch.c:30:0:
./stdio.h:434:1: error: ‘gets’ undeclared here (not in a function)
make[4]: *** [localcharset.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: *** [argmatch.o] Error 1
make[4]: Leaving directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7/gnu'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7/gnu'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7/gnu'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/app-shells/rush-1.7/work/rush-1.7'
make: *** [all] Error 2
emake failed

• ERROR: app-shells/rush-1.7 failed (compile phase):
• emake failed