Attempting build of cURL 7.65.3 on Red Hat Enterprise Linux 6 machine fails with following messages:

...
CC curl-tool_helpers.o
CC curl-tool_homedir.o
HUGE tool_hugehelp.c
CC curl-tool_hugehelp.o
tool_hugehelp.c:8330:6: error: redefinition of ‘hugehelp’
void hugehelp(void)
^
tool_hugehelp.c:8:6: note: previous definition of ‘hugehelp’ was here
void hugehelp(void)
^
make[3]: *** [curl-tool_hugehelp.o] Error 1
make[3]: Leaving directory '/home/builder/lware/RDVAS-2027/curl_new/src-static/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/builder/lware/RDVAS-2027/curl_new/src-static/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/builder/lware/RDVAS-2027/curl_new/src-static'
make: *** [libcurl] Error 2

After some investigation I found that this line in src/Makefile.in is the culprit:

@HAVE_LIBZ_FALSE@@USE_MANUAL_TRUE@ $(HUGECMD)(echo '#include "tool_setup.h"' > $(HUGE): \

The colon near the end of the line causes it to create a file named "tool_hugehelp.c:", which is not what is intended. Changing the colon character to a semicolon fixes the problem:

@HAVE_LIBZ_FALSE@@USE_MANUAL_TRUE@ $(HUGECMD)(echo '#include "tool_setup.h"' > $(HUGE); \