Hi,it should be a bug introduced by your compiler or python or both. It works with my pyferret, not starting as python module but directly.
I build myself from scratch with gcc-7 and python/3.7.4. The latter is installed with a miniconda and "seems" to be based on gcc-7 too, so all fortran related libraries (and others) should fit well, libgfortran.so.4 is linked in.
All the best, Martin (ferret is a script arranging the environment and calling pyferret.) blogin1: NOAA/PMEL TMAP PyFerret v7.5 (optimized) Linux 3.10.0-957.21.3.el7.x86_64 - 12/28/19 17-Jan-20 19:51 yes? yes? let/units="m" oldvar = 777. yes? yes? let/like=oldvar newvar = 666. yes? yes? list newvar VARIABLE : 777. (m) 666.0 Am 17.01.2020 um 17:09 schrieb Marco van Hulten:
Hello Ferretters— In classic Ferret 7.5 this works: yes? let/units="m" oldvar = 777. yes? let/like=oldvar newvar = 666. yes? list newvar VARIABLE : 777. (m) 666.0 but in PyFerret 7.3 it does not: yes? let/units="m" oldvar = 777. yes? let/like=oldvar newvar = 666. **ERROR: unknown command qualifier: like=oldvar Is /like= removed in PyFerret, or is it a bug in version 7.3? —Marco