More gnuCOBOL issues in Tumbleweed

Had successfully compiled a simple program. But the latest compile attempt give me…

bill@bill-MS-7B79:~/Mystuff/COBOL/progs/Primes> cobc PRIMCOB1.cbl  
/tmp/cob5820_0.c:11:10: fatal error: gmp.h: No such file or directory
  11 | #include <gmp.h>
     |          ^~~~~~~
compilation terminated.
bill@bill-MS-7B79:~/Mystuff/COBOL/progs/Primes>

Solved: Had to select gmp-devl in YaST Software. This selected 2 other packages also.

libgmp10 already was checked