Fortran program error message

Mon Feb 28 15:30:00 GMT 2011

Dear Users,
I can't run the following fortran script in my cygwin bash, I'm getting the following error message:
$ g77 geometry.f -o geometry
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0x82d): undefined reference to `_zspl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0x860): undefined reference to `_zspl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0x92e): undefined reference to `_spl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0x95b): undefined reference to `_spl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0x9e8): undefined reference to `_zspl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0xa1b): undefined reference to `_zspl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0xb5d): undefined reference to `_spl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0xb8d): undefined reference to `_spl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0xc71): undefined reference to `_spl3_'
/cygdrive/c/DOCUME~1/ADMINI~1/CONFIG~1/Temp/ccmHGeab.o:geometry.f:(.text+0xca1): undefined reference to `_spl3_'
collect2: ld returned 1 exit status
I also copied in my current directory the file cygwin1.dll. I didn't 
write this program, I just found in internet and wanted to run it in 
cygwin. The script can be found here: 
http://www2.geo.uib.no/nav-processing/geometry/geometry.php
Is it possible to run fortran programs in cygwin? I've searched for a 
simple answer in google but didn't find it. I'd be very grateful if 
someone could provide me some "simple" ideas to solve this issue.
Very grateful for you time and attention,
Gery

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