twm fails in cross compile

[Harold L Hunt II]

making all in programs/twm...
make[4]: Entering directory 
`/home/harold/x-devel/4.3/build/std/programs/twm'
/home/harold/cygwin/bin/`echo gcc|sed "s%.*/%%"` -O2 
-fno-strength-reduce -Wall -Wpointer-arith -Wundef     -I../.. 
-I../../exports/include   -D__i386__ -DWIN32_LEAN_AND_MEAN -DX_LOCALE 
-D_X86_ -D__CYGWIN__ -D_XOPEN_SOURCE -D_POSIX_C_SOURCE=199309L 
-D_BSD_SOURCE -D_SVID_SOURCE -D_GNU_SOURCE -DNO_ALLOCA  -DFUNCPROTO=15 
-DNARROWPROTO        -c -o gram.o gram.c
y.tab.c: In function `yyparse':
y.tab.c:1064: warning: suggest parentheses around assignment used as 
truth value
y.tab.c:1112: warning: label `yyerrlab' defined but not used
y.tab.c:1107: warning: label `yynewerror' defined but not used
/home/harold/cygwin/i686-pc-cygwin/include/stdio.h: At top level:
gram.c:2: warning: `yysccsid' defined but not used
/home/harold/cygwin/bin/`echo gcc|sed "s%.*/%%"` -O2 
-fno-strength-reduce -Wall -Wpointer-arith -Wundef     -I../.. 
-I../../exports/include   -D__i386__ -DWIN32_LEAN_AND_MEAN -DX_LOCALE 
-D_X86_ -D__CYGWIN__ -D_XOPEN_SOURCE -D_POSIX_C_SOURCE=199309L 
-D_BSD_SOURCE -D_SVID_SOURCE -D_GNU_SOURCE -DNO_ALLOCA  -DFUNCPROTO=15 
-DNARROWPROTO        -c -o lex.o lex.c
<stdout>:23:55: stdint.h: No such file or directory
<stdout>: In function `yylex':
<stdout>:825: warning: label `find_rule' defined but not used
/home/harold/cygwin/i686-pc-cygwin/include/stdio.h: At top level:
<stdout>:1256: warning: `yyunput' defined but not used
<stdout>:1866: warning: `yy_flex_strlen' defined but not used
make[4]: *** [lex.o] Error 1


Notice stdint.h is not found when building in programs/twm.

Not sure what is causing this one.  Any ideas?

Harold