Per your suggestion, I ran:
$ ./autogen.sh --disable-werror
$ ./configure --disable-werror
$ gmake => breaks with below. (also tried with $ gmake -Wno-error).
Where to go from here?
gmake all-am
gmake[3]: Entering directory `/asp/git/grub/grub-core'
gcc -DHAVE_CONFIG_H -I. -I.. -Wall -W -I../include -I../include
-DGRUB_MACHINE_PCBIOS=1 -DGRUB_MACHINE=I386_PC
-DGRUB_TARGET_CPU_I386=1 -m32 -nostdinc -isystem /usr/include
-DGRUB_FILE=\"gnulib/regex.c\" -I. -I. -I.. -I.. -I../include
-I../include -I../grub-core/lib/libgcrypt-grub/include
-I../grub-core/lib/libgcrypt-grub/src/ -I../grub-core/lib/posix_wrap
-I../grub-core/gnulib -I../grub-core/gnulib
-I/usr/local/include -Os -Wall -W -Wshadow -Wold-style-definition
-Wpointer-arith -Wundef -Wextra -Wattributes -Wcast-align
-Wchar-subscripts -Wcomment -Wdeprecated-declarations
-Wdisabled-optimization -Wdiv-by-zero -Wendif-labels -Wfloat-equal
-Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit
-Wimplicit-function-declaration -Wimplicit-int -Winit-self
-Wint-to-pointer-cast -Winvalid-pch -Wmain -Wmissing-braces
-Wmissing-field-initializers -Wmissing-format-attribute -Wmultichar
-Wnonnull -Woverflow -Wparentheses -Wpointer-arith
-Wpointer-to-int-cast -Wreturn-type -Wsequence-point -Wshadow
-Wsign-compare -Wstrict-aliasing -Wswitch -Wtrigraphs -Wundef
-Wunknown-pragmas -Wunused -Wunused-function -Wunused-label
-Wunused-parameter -Wunused-value -Wunused-variable -Wvariadic-macros
-Wvolatile-register-var -Wwrite-strings -Wnested-externs
-Wstrict-prototypes -Wpointer-sign -g -Wredundant-decls
-Wmissing-prototypes -Wmissing-declarations -falign-jumps=1
-falign-loops=1 -falign-functions=1 -mno-mmx -mno-sse -mno-sse2
-mno-3dnow -m32 -fno-stack-protector -mno-stack-arg-probe
-Wtrampolines -mrtd -mregparm=3 -freg-struct-return
-Dfloat=__grub_poison -Ddouble=__grub_poison -fno-builtin -fno-builtin
-Wno-undef -Wno-sign-compare -Wno-unused -Wno-unused-parameter
-Wno-redundant-decls -Wno-unreachable-code -Wno-conversion
-Wno-old-style-definition -Wno-unsafe-loop-optimizations
-MT gnulib/libgnulib_a-regex.o -MD -MP -MF
gnulib/.deps-core/libgnulib_a-regex.Tpo -c -o
gnulib/libgnulib_a-regex.o `test -f 'gnulib/regex.c' || echo
'./'`gnulib/regex.c
In file included from /usr/include/sys/_types.h:33,
from /usr/include/stdarg.h:35,
from ../include/grub/misc.h:23,
from ../grub-core/lib/posix_wrap/sys/types.h:22,
from ../grub-core/gnulib/regex.h:24,
from gnulib/regex.c:67:
/usr/include/machine/_types.h:65: error: expected '=', ',', ';', 'asm'
or '__attribute__' before '__double_t'
/usr/include/machine/_types.h:66: error: expected '=', ',', ';', 'asm'
or '__attribute__' before '__float_t'
gmake[3]: *** [gnulib/libgnulib_a-regex.o] Error 1
gmake[3]: Leaving directory `/asp/git/grub/grub-core'
gmake[2]: *** [all] Error 2
gmake[2]: Leaving directory `/asp/git/grub/grub-core'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/asp/git/grub'
gmake: *** [all] Error 2
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