/constants.h need a empty line at EOF.
Go to the last line at EOF, at a empty line at EOF and save.
{
extern void php3_defined(INTERNAL_FUNCTION_PARAMETERS);



#endif

~
~
}

uw01#root@/big/nodel/php-3.0>make
        cc -g   -I. -I.   -I../apache_1.3.0/src/include -I../apache_1.3.0/src/os
/unix                 -c language-parser.tab.c
UX:acomp: ERROR: "./constants.h", line 40: #ifndef on line 1 has no matching #en
dif
UX:acomp: WARNING: "./constants.h", line 40: newline not last character in file
UX:acomp: ERROR: "./constants.h", line 40: #if-less #endif
*** Error code 1 (bu21)
UX:make: ERROR: fatal error.