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I think I saw hardcoded -j$(nproc) on some other package in past, it didn't occur to me to check makepkg's settings. Thanks for sound advice!

Thanks for your comment. If you want to make use of multiple cores just edit your /etc/makepkg.conf file and set MAKEFLAGS variable. That way you won't need to pass -j argument to make.

Would it be worthwhile to enable parallel build?

--- PKGBUILD    2023-12-16 14:01:18.050664940 +0100
+++ PKGBUILD_multi  2023-12-16 14:01:12.417331413 +0100
@@ -18,8 +18,8 @@
 build() {
     mkdir -p "$srcdir/$_archive_dir/build"
     cd "$srcdir/$_archive_dir/build"
-    cmake "$srcdir/$_archive_dir" -DCMAKE_BUILD_TYPE=release -DOPENAL_SOUND=1 -DASSERTS=1 -DDEV_BUILD=0 -DCMAKE_INSTALL_PREFIX="/usr" -DCOLOBOT_INSTALL_BIN_DIR="/usr/bin"  -DCMAKE_CXX_FLAGS="-Wno-stringop-truncation -Wno-error=format-overflow"
-    make
+    cmake "$srcdir/$_archive_dir" -DCMAKE_BUILD_TYPE=release -DOPENAL_SOUND=1 -DASSERTS=1 -DDEV_BUILD=0 -DCMAKE_INSTALL_PREFIX="/usr" -DCOLOBOT_INSTALL_BIN_DIR="/usr/bin" -DCMAKE_CXX_FLAGS="-Wno-stringop-truncation -Wno-error=format-overflow"
+    make -j$(nproc)
 }

 package() {

It has cut down build time in half for me.

After creating the link sudo ln /usr/lib/libboost_filesystem.so.1.83.0 /usr/lib/libboost_filesystem.so.1.81.0, I get the following error

colobot: symbol lookup error: colobot: undefined symbol: _ZNK5boost10filesystem4path7stem_v3Ev

Just rebuild the package for it to be linked with the new version of libboost

how to fix the error? colobot: error while loading shared libraries: libboost_filesystem.so.1.81.0: cannot open shared object file: No such file or directory

I see it fails only if you have pod2man and po4a both installed

po4a::chooser: Erreur de chargement de module : Can't locate Pod/Parser.pm in @INC (you may need to install the Pod::Parser module) (@INC contains: /usr/lib/perl5/5.34/site_perl /usr/share/perl5/site_perl /usr/lib/perl5/5.34/vendor_perl /usr/share/perl5/vendor_perl /usr/lib/perl5/5.34/core_perl /usr/share/perl5/core_perl) at /usr/share/perl5/vendor_perl/Locale/Po4a/Pod.pm line 14.
BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/Locale/Po4a/Pod.pm line 14.
Compilation failed in require at (eval 38) line 1.
BEGIN failed--compilation aborted at (eval 38) line 1.

The package need a new build dependency perl-pod-parser is required for building the .pod files

I've reported compilation error on github. This is most likely due to GCC/clang update.

https://github.com/colobot/colobot/issues/1450

The package is not building, it fails with this error.

[ 64%] Building CXX object src/CMakeFiles/colobotbase.dir/sound/sound_type.cpp.o
In file included from /home/eragon/.cache/paru/clone/colobot-gold/src/colobot-colobot-gold-0.1.12-alpha/src/script/script.cpp:21:
/home/eragon/.cache/paru/clone/colobot-gold/src/colobot-colobot-gold-0.1.12-alpha/src/script/script.h:81:89: error: 'numeric_limits' is not a member of 'std'
   81 |     static void ColorizeScript(Ui::CEdit* edit, int rangeStart = 0, int rangeEnd = std::numeric_limits<int>::max());
      |                                                                                         ^~~~~~~~~~~~~~
/home/eragon/.cache/paru/clone/colobot-gold/src/colobot-colobot-gold-0.1.12-alpha/src/script/script.h:81:104: error: expected primary-expression before 'int'
   81 |     static void ColorizeScript(Ui::CEdit* edit, int rangeStart = 0, int rangeEnd = std::numeric_limits<int>::max());
      |                                                                                                        ^~~
[ 65%] Building CXX object src/CMakeFiles/colobotbase.dir/ui/controls/button.cpp.o
[ 65%] Building CXX object src/CMakeFiles/colobotbase.dir/ui/controls/check.cpp.o
[ 66%] Building CXX object src/CMakeFiles/colobotbase.dir/ui/controls/color.cpp.o
[ 66%] Building CXX object src/CMakeFiles/colobotbase.dir/ui/controls/control.cpp.o
[ 66%] Building CXX object src/CMakeFiles/colobotbase.dir/ui/controls/edit.cpp.o
[ 67%] Building CXX object src/CMakeFiles/colobotbase.dir/ui/controls/editvalue.cpp.o
make[2]: *** [src/CMakeFiles/colobotbase.dir/build.make:2134: src/CMakeFiles/colobotbase.dir/script/script.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /home/eragon/.cache/paru/clone/colobot-gold/src/colobot-colobot-gold-0.1.12-alpha/src/ui/controls/edit.cpp:38:
/home/eragon/.cache/paru/clone/colobot-gold/src/colobot-colobot-gold-0.1.12-alpha/src/script/script.h:81:89: error: 'numeric_limits' is not a member of 'std'
   81 |     static void ColorizeScript(Ui::CEdit* edit, int rangeStart = 0, int rangeEnd = std::numeric_limits<int>::max());
      |                                                                                         ^~~~~~~~~~~~~~
/home/eragon/.cache/paru/clone/colobot-gold/src/colobot-colobot-gold-0.1.12-alpha/src/script/script.h:81:104: error: expected primary-expression before 'int'
   81 |     static void ColorizeScript(Ui::CEdit* edit, int rangeStart = 0, int rangeEnd = std::numeric_limits<int>::max());
      |                                                                                                        ^~~
make[2]: *** [src/CMakeFiles/colobotbase.dir/build.make:2246: src/CMakeFiles/colobotbase.dir/ui/controls/edit.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:276: src/CMakeFiles/colobotbase.dir/all] Error 2
make: *** [Makefile:156: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...
error: failed to build 'colobot-gold-0.1.12_alpha-1': 
error: packages failed to build: colobot-gold-0.1.12_alpha-1