# Error compiling gromacs 2020.5 patched with Colvar module

**URL:** <https://gromacs.bioexcel.eu/t/error-compiling-gromacs-2020-5-patched-with-colvar-module/3048>\
**Category:** User discussions\
**Tags:** installation-error, colvars\
**Created:** [October 29, 2021, 1:01am UTC](https://gromacs.bioexcel.eu/t/error-compiling-gromacs-2020-5-patched-with-colvar-module/3048 "2021-10-29T01:01:43Z")\
**Posts on this page:** 1\
**Showing post:** 7

<div class="post-metadata">

**Author:** ![giacomo.fiorin](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/giacomo.fiorin/32/2862_2.png) [@giacomo.fiorin](https://gromacs.bioexcel.eu/u/giacomo.fiorin)\
**Post date:** [October 29, 2021, 9:06pm UTC](https://gromacs.bioexcel.eu/t/error-compiling-gromacs-2020-5-patched-with-colvar-module/3048/7 "2021-10-29T21:06:02Z")

</div>

FYI should you need GCC 11 for any reason, apply this patch, which fixes a missing include in the GROMACS files.

```auto
diff --git a/src/gromacs/awh/biasparams.cpp b/src/gromacs/awh/biasparams.cpp
index 6f9b0d387d..2bcc711a62 100644
--- a/src/gromacs/awh/biasparams.cpp
+++ b/src/gromacs/awh/biasparams.cpp
@@ -47,6 +47,7 @@
 #include "biasparams.h"
 
 #include <cmath>
+#include <limits>
 
 #include <algorithm>
 
diff --git a/src/gromacs/modularsimulator/modularsimulator.cpp b/src/gromacs/modularsimulator/modularsimulator.cpp
index 2d785ab50f..8a94e9f106 100644
--- a/src/gromacs/modularsimulator/modularsimulator.cpp
+++ b/src/gromacs/modularsimulator/modularsimulator.cpp
@@ -39,6 +39,8 @@
  * \ingroup module_modularsimulator
  */
 
+#include <limits>
+
 #include "gmxpre.h"
 
 #include "modularsimulator.h"

```

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