# Compilation Errors with RTTOV **URL:** \ **Category:** Uncategorized\ **Created:** [February 6, 2025, 1:24pm UTC](https://forums.jcsda.org/t/compilation-errors-with-rttov/656 "2025-02-06T13:24:01Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Melani](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Melani](https://forums.jcsda.org/u/Melani)\ **Post date:** [February 6, 2025, 1:24pm UTC](https://forums.jcsda.org/t/compilation-errors-with-rttov/656/1 "2025-02-06T13:24:01Z")
Hi, I tried to compile JEDI-MPAS with RTTOV 13.2, but the compilation stopped with several errors. ## The first issue is related to the lack of class “mixratio\_to\_ppmv” that there is no present anywhere, as described below: ufo/src/ufo/CMakeFiles/ufo.dir/operators/rttov/ufo\_radiancerttov\_utils\_mod.F90.o /home/jedi/source/MPAS\_bundle3.0.2/ufo/src/ufo/operators/rttov/ufo\_radiancerttov\_utils\_mod.F90: 29 | gas\_name, mixratio\_to\_ppmv, & | 1 Error: Symbol ˜mixratio\_to\_ppmv" referenced at (1) not found in module ˜rttov\_const" /home/jedi/source/MPAS\_bundle 3.0.2/ufo/src/ufo/operators/rttov/ufo\_radiancerttov\_utils\_mod.F90: ## 96 | mixratio\_to\_ppmv(1:ngases\_max)] ! N.B. uses ufo-specific array in rttov\_const | 1 Error: Syntax error in argument list at (1) Does anyone have experience using this RTM in MPAS-JEDI and give me some suggestions on how to fix the RTTOV compilation? Thanks you very much, Samantha Melani