All I've got is /usr/lib64/libmpfr.so -> /usr/lib64/libmpfr.so.1.2.0. in /usr/lib64 Is this the correct libmpfr version? /usr/lib64 is on the first line on ld.so.conf ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ron Stubbs MS CS Senior Systems Programmer Research Computing Pratt School of Engineering 410 Teer Bldg. P.O. Box 90271 Duke University, Durham, N.C. 27708-0271 office: (919)660-5339 cell:(919)641-5689 fax: (919) 613-9156 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On 08/15/2012 03:35 PM, Marc Glisse wrote: > On Wed, 15 Aug 2012, Ron Stubbs wrote: > >> arith.c:(.text+0x1169): undefined reference to `mpfr_get_z_2exp' > [...] >> Suggestions? > > You have 2 versions of mpfr on that computer. Remove one. >