diff --git a/.github/workflows/check-linux-mpi.yaml b/.github/workflows/check-linux-mpi.yaml
index 4a9c77f4..3ec5cd0f 100644
--- a/.github/workflows/check-linux-mpi.yaml
+++ b/.github/workflows/check-linux-mpi.yaml
@@ -19,18 +19,18 @@ jobs:
       matrix:
         config:
           - {os: ubuntu-latest, r: 'release', mpi: 'openmpi'}
-          - {os: ubuntu-22.04, r: 'release', mpi: 'mpich'}
+          - {os: ubuntu-latest, r: 'release', mpi: 'mpich'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       R_KEEP_PKG_SOURCE: yes
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           path: RNetCDF
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           repository: Unidata/netcdf-c
           path: netcdf-c
@@ -46,8 +46,8 @@ jobs:
       - name: Install system dependencies
         run: |
           case "${{ matrix.config.mpi }}" in
-            openmpi) sudo apt-get install -y libhdf5-openmpi-dev openmpi-bin ;;
-            mpich) sudo apt-get install -y libhdf5-mpich-dev mpich ;;
+            openmpi) sudo apt-get install -y libhdf5-openmpi-dev openmpi-bin libxml2-dev ;;
+            mpich) sudo apt-get install -y libhdf5-mpich-dev mpich libxml2-dev ;;
             *) echo "Unknown MPI variant"; exit 1 ;;
           esac
         shell: bash
@@ -60,7 +60,8 @@ jobs:
           echo ::endgroup::
           echo ::group::configure
           inc_path="/usr/include/hdf5/${{ matrix.config.mpi }}"
-          lib_path="/usr/lib/x86_64-linux-gnu/hdf5/${{ matrix.config.mpi }}"
+          arch=$( uname -m )
+          lib_path="/usr/lib/${arch}-linux-gnu/hdf5/${{ matrix.config.mpi }}"
           ./configure CC="mpicc.${{ matrix.config.mpi }}" \
             CPPFLAGS="-I${inc_path}" \
             LDFLAGS="-L${lib_path} -Wl,-rpath=${lib_path}"
@@ -78,16 +79,24 @@ jobs:
           cat("::group::bit64\n")
           install.packages("bit64")
           cat("::endgroup::\n")
+          arch <- Sys.info()["machine"]
           if ("${{ matrix.config.mpi }}" == "openmpi") {
             Rmpi_type <- "OPENMPI"
             pbdMPI_type <- "OPENMPI"
-            mpi_include <- "/usr/lib/x86_64-linux-gnu/openmpi/include"
-            mpi_lib <- "/usr/lib/x86_64-linux-gnu/openmpi/lib"
+            mpi_include <- sprintf("/usr/lib/%s-linux-gnu/openmpi/include", arch)
+            mpi_lib <- sprintf("/usr/lib/%s-linux-gnu/openmpi/lib", arch)
           } else if ("${{ matrix.config.mpi }}" == "mpich") {
             Rmpi_type <- "MPICH2"
             pbdMPI_type <- "MPICH3"
-            mpi_include <- "/usr/include/x86_64-linux-gnu/mpich"
-            mpi_lib <- "/usr/lib/x86_64-linux-gnu"
+            mpi_include <- sprintf("/usr/include/%s-linux-gnu/mpich", arch)
+            # Workaround missing libopa and libmpl in recent mpich packages:
+            mpi_lib_real <- sprintf("/usr/lib/%s-linux-gnu/mpich/lib", arch)
+            mpi_lib <- file.path(getwd(), "mpich")
+            dir.create(mpi_lib)
+            for (destlib in c("libmpich.so", "libopa.so", "libmpl.so")) {
+              file.symlink(file.path(mpi_lib_real, "libmpich.so"),
+                file.path(mpi_lib, destlib))
+            }
           } else {
             stop("Unknown MPI variant")
           }
@@ -118,6 +127,8 @@ jobs:
           Rscript -e "library(Rmpi); library(pbdMPI);"
           mpicc="mpicc.${{ matrix.config.mpi }}"
           mpiexec="mpiexec.${{ matrix.config.mpi }}"
+          export LD_LIBRARY_PATH="$PWD/mpich:$LD_LIBRARY_PATH"
+          echo "LD_LIBRARY_PATH='$LD_LIBRARY_PATH'"
           R CMD check --no-manual \
             --install-args="--configure-args='--with-cc=$mpicc --with-mpiexec=$mpiexec'" \
             RNetCDF_*.*-*.tar.gz
@@ -126,7 +137,7 @@ jobs:
 
       - name: Upload check directory
         if: success() || failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ${{ matrix.config.os }}_r-${{ matrix.config.r }}_${{ matrix.config.mpi }}
           path: RNetCDF.Rcheck/
diff --git a/DESCRIPTION b/DESCRIPTION
index b493bbf6..9e34e152 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: RNetCDF
-Version: 2.11-1
-Date: 2025-04-30
+Version: 2.11-2
+Date: 2026-07-19
 Title: Interface to 'NetCDF' Datasets
 Authors@R: c(person("Pavel", "Michna", role = "aut",
                     email = "rnetcdf-devel@bluewin.ch"),
diff --git a/INSTALL b/INSTALL
index 35b428f1..538363ff 100644
--- a/INSTALL
+++ b/INSTALL
@@ -97,7 +97,7 @@ R CMD INSTALL Example
 
 R CMD INSTALL --configure-args="CPPFLAGS=-I/sw/include \
     LDFLAGS=-L/sw/lib LIBS=-lhdf5 --with-cc=mpicc --with-mpiexec=mpiexec" \
-    RNetCDF_2.11-1.tar.gz
+    RNetCDF_2.11-2.tar.gz
 
 
 LD_LIBRARY_PATH
@@ -126,7 +126,7 @@ R CMD check Example
 ===================
 
 R CMD check --install-args="--configure-args='CPPFLAGS=-I/sw/include \
-    LDFLAGS=-L/sw/lib'" RNetCDF_2.11-1.tar.gz
+    LDFLAGS=-L/sw/lib'" RNetCDF_2.11-2.tar.gz
 
 
 Time units
diff --git a/LICENSE b/LICENSE
index c440e610..45d77bb6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -6,7 +6,7 @@ RNetCDF
 =======
 
 All files except those indicated later are
-Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
 They are licensed under the terms of the GNU General Public License:
 
     This program is free software; you can redistribute it and/or modify
diff --git a/NEWS b/NEWS
index f3750931..ee7297f5 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+Version 2.11-2, 2026-07-19
+  * Fix compiler warning for C23 standard on Fedora 44
+
 Version 2.11-1, 2025-04-30
   * Do not use nc-config compiler by default
   * Use new R API functions for environments
diff --git a/R/RNetCDF.R b/R/RNetCDF.R
index a05af218..13b61215 100644
--- a/R/RNetCDF.R
+++ b/R/RNetCDF.R
@@ -7,7 +7,7 @@
 #  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
 #              Milton Woods (miltonjwoods@gmail.com)
 #
-#  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+#  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
 #
 #===============================================================================
 #
diff --git a/R/config.R.in b/R/config.R.in
index a951ee93..199e8c37 100644
--- a/R/config.R.in
+++ b/R/config.R.in
@@ -7,7 +7,7 @@
 #  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
 #              Milton Woods (miltonjwoods@gmail.com)
 #
-#  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+#  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
 #
 #===============================================================================
 #
diff --git a/configure b/configure
index a48f4df8..31b529ce 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.72 for RNetCDF 2.11-1.
+# Generated by GNU Autoconf 2.72 for RNetCDF 2.11-2.
 #
 #
 # Copyright (C) 1992-1996, 1998-2017, 2020-2023 Free Software Foundation,
@@ -601,8 +601,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='RNetCDF'
 PACKAGE_TARNAME='rnetcdf'
-PACKAGE_VERSION='2.11-1'
-PACKAGE_STRING='RNetCDF 2.11-1'
+PACKAGE_VERSION='2.11-2'
+PACKAGE_STRING='RNetCDF 2.11-2'
 PACKAGE_BUGREPORT=''
 PACKAGE_URL=''
 
@@ -1259,7 +1259,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-'configure' configures RNetCDF 2.11-1 to adapt to many kinds of systems.
+'configure' configures RNetCDF 2.11-2 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1321,7 +1321,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of RNetCDF 2.11-1:";;
+     short | recursive ) echo "Configuration of RNetCDF 2.11-2:";;
    esac
   cat <<\_ACEOF
 
@@ -1412,7 +1412,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-RNetCDF configure 2.11-1
+RNetCDF configure 2.11-2
 generated by GNU Autoconf 2.72
 
 Copyright (C) 2023 Free Software Foundation, Inc.
@@ -1929,7 +1929,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by RNetCDF $as_me 2.11-1, which was
+It was created by RNetCDF $as_me 2.11-2, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -7542,7 +7542,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by RNetCDF $as_me 2.11-1, which was
+This file was extended by RNetCDF $as_me 2.11-2, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -7606,7 +7606,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-RNetCDF config.status 2.11-1
+RNetCDF config.status 2.11-2
 configured by $0, generated by GNU Autoconf 2.72,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index c6f8222c..83b0c8b7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 #  Initialize                                                    		#
 #-------------------------------------------------------------------------------#
 
-AC_INIT([RNetCDF],[2.11-1])
+AC_INIT([RNetCDF],[2.11-2])
 
 : ${R_HOME=`R RHOME`}
 AS_IF([test -z "${R_HOME}"],
diff --git a/src/RNetCDF.h b/src/RNetCDF.h
index 3b3770e1..d8cdd47c 100644
--- a/src/RNetCDF.h
+++ b/src/RNetCDF.h
@@ -2,14 +2,14 @@
  *
  *  Name:       RNetCDF.h
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    Declare RNetCDF functions callable from R
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/attribute.c b/src/attribute.c
index ffe8d0cc..add651ef 100644
--- a/src/attribute.c
+++ b/src/attribute.c
@@ -2,14 +2,14 @@
  *
  *  Name:       attribute.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    NetCDF attribute functions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/common.c b/src/common.c
index 7746e321..6bedd62a 100644
--- a/src/common.c
+++ b/src/common.c
@@ -2,14 +2,14 @@
  *
  *  Name:       common.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    Common definitions for RNetCDF functions
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
@@ -64,7 +64,7 @@ R_nc_strcmp (SEXP var, const char *str)
 size_t
 R_nc_strnlen (const char *str, char chr, size_t maxlen)
 {
-  char *nullchr;
+  const char *nullchr;
   nullchr = memchr(str, (int) chr, maxlen);
   return (nullchr == NULL) ? maxlen : ((size_t) (nullchr - str));
 }
diff --git a/src/common.h b/src/common.h
index 6e703098..a8276604 100644
--- a/src/common.h
+++ b/src/common.h
@@ -2,14 +2,14 @@
  *
  *  Name:       common.h
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    Common definitions for RNetCDF functions
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/convert.c b/src/convert.c
index da25f4e1..901b299d 100644
--- a/src/convert.c
+++ b/src/convert.c
@@ -4,14 +4,14 @@
  *
  *  Name:       convert.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    Type conversions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/convert.h b/src/convert.h
index 98c3c666..1a902b82 100644
--- a/src/convert.h
+++ b/src/convert.h
@@ -2,14 +2,14 @@
  *
  *  Name:       convert.h
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    Type conversions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/dataset.c b/src/dataset.c
index 8676afbb..1a3090cd 100644
--- a/src/dataset.c
+++ b/src/dataset.c
@@ -2,14 +2,14 @@
  *
  *  Name:       dataset.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    NetCDF dataset functions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/dimension.c b/src/dimension.c
index 4c0c79df..088f2365 100644
--- a/src/dimension.c
+++ b/src/dimension.c
@@ -2,14 +2,14 @@
  *
  *  Name:       dimension.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    NetCDF dimension functions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/group.c b/src/group.c
index 4c4a533d..2bb428cb 100644
--- a/src/group.c
+++ b/src/group.c
@@ -2,14 +2,14 @@
  *
  *  Name:       group.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    NetCDF group functions for RNetCDF.
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/init.c b/src/init.c
index a6d2e9ac..e8d19739 100644
--- a/src/init.c
+++ b/src/init.c
@@ -2,14 +2,14 @@
  *
  *  Name:       common.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    RNetCDF initialisation
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/type.c b/src/type.c
index 54ca435d..d3eff22b 100644
--- a/src/type.c
+++ b/src/type.c
@@ -2,14 +2,14 @@
  *
  *  Name:       type.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    NetCDF type functions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/udunits.c b/src/udunits.c
index 6f1c39c5..29d6d48d 100644
--- a/src/udunits.c
+++ b/src/udunits.c
@@ -2,14 +2,14 @@
  *
  *  Name:       udunits.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    udunits2 functions for RNetCDF.
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/src/variable.c b/src/variable.c
index 711d77c0..5c8d0182 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -2,14 +2,14 @@
  *
  *  Name:       variable.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    NetCDF variable functions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *
diff --git a/tests/RNetCDF-test.R b/tests/RNetCDF-test.R
index 4f2b29a8..99b5c77d 100644
--- a/tests/RNetCDF-test.R
+++ b/tests/RNetCDF-test.R
@@ -2,14 +2,14 @@
 #
 #  Name:       RNetCDF-test.R
 #
-#  Version:    2.11-1
+#  Version:    2.11-2
 #
 #  Purpose:    Test functions to the NetCDF interface for R.
 #
 #  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
 #              Milton Woods (miltonjwoods@gmail.com)
 #
-#  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+#  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
 #
 #===============================================================================#
 #
diff --git a/tools/convert.m4 b/tools/convert.m4
index 67f5af90..1ca4ada9 100644
--- a/tools/convert.m4
+++ b/tools/convert.m4
@@ -5,14 +5,14 @@ dnl Insert warning into generated C code:
  *
  *  Name:       convert.c
  *
- *  Version:    2.11-1
+ *  Version:    2.11-2
  *
  *  Purpose:    Type conversions for RNetCDF
  *
  *  Author:     Pavel Michna (rnetcdf-devel@bluewin.ch)
  *              Milton Woods (miltonjwoods@gmail.com)
  *
- *  Copyright (C) 2004-2025 Pavel Michna and Milton Woods.
+ *  Copyright (C) 2004-2026 Pavel Michna and Milton Woods.
  *
  *=============================================================================*
  *