Hello list I try to install ifeffit 1.2.9 on Linux Bluewhite64 12.0 (slackware 12.0 based) PGPLOt run perfectely, ./configure ifeffit ok but when compile, error message: ... /usr/local/src/ifeffit-1.2.9/src/lib/iff_cursor.f:68: undefined reference to `_gfortran_concat_string' /usr/X11R6/lib/libgfortranbegin.a(fmain.o): In function `main': (.text+0x5): undefined reference to `_gfortran_set_args' /usr/local/pgplot//libpgplot.so: undefined reference to `_gfortran_pow_i4_i4' /usr/local/pgplot//libpgplot.so: undefined reference to `_gfortran_transfer_array' /usr/local/pgplot//libpgplot.so: undefined reference to `_gfortran_pow_r4_i4' collect2: ld returned 1 exit status make[3]: *** [ifftest1] Error 1 make[3]: Leaving directory `/usr/local/src/ifeffit-1.2.9/src/test' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/usr/local/src/ifeffit-1.2.9/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/usr/local/src/ifeffit-1.2.9' make: *** [all-recursive-am] Error 2 My computer: Linux chy 2.6.21.5 #1 SMP Fri Jun 15 08:49:16 EEST 2007 x86_64 Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz GenuineIntel GNU/Linux Same idea about this error message, Thanks Ch -- Chachi Rojas Ayala GMC FCF UNMSM Claro:01-97489347 email:crojasa@unmsm.edu.pe chachi.rojas@gmail.com