Error when installing: `SIG_IGN' undeclared

[Miguel Cuesta]

Hi.

Trying to install m4-1.4.2 on Cygwin (MS Windows 2000)

When trying to 'make', I get this error message:
-------------------------------
make[1]: Entering directory `/home/root/m4-1.4.2/src'
gcc -c -DHAVE_CONFIG_H -I.. -I. -I./../lib  -g -O2 m4.c
m4.c: In function `main':
m4.c:451: error: `SIG_IGN' undeclared (first use in this function)
m4.c:451: error: (Each undeclared identifier is reported only once
m4.c:451: error: for each function it appears in.)
make[1]: *** [m4.o] Error 1
make[1]: Leaving directory `/home/root/m4-1.4.2/src'
make: *** [all] Error 1
---------------------------

Any suggestion?