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@fenuks Thanks for the tip.

@pppbb Just apply the patch and remove bits you don't like or copy change from it in prepare() function.

@fenuks Could you post patch only with workaround for last issue?

Downgrading boost isn't a particularly good idea given it will break a number of programs that were built against the latest version. If you applied the patch I provided, you would probably have noticed it contains a workaround for this issue.

I downgraded boost but i got another problem: Make Error at clientapp/cmake_install.cmake:70 (file): file INSTALL cannot find "/home/piotr/.cache/yay/vcmi-git/src/vcmi-git/clientapp/icons/vcmiclient.16x16.png": No such file or directory. Call Stack (most recent call first): cmake_install.cmake:77 (include)

@pppbb Probably upstream will update code to the newest boost version, in the meanwhile, you can use this patch.

diff --git c/PKGBUILD i/PKGBUILD
index c0613a1..90250ae 100644
--- c/PKGBUILD
+++ i/PKGBUILD
@@ -21,8 +21,13 @@ install="${pkgname}.install"
 source=("${pkgname}::git+https://github.com/vcmi/vcmi.git#branch=develop"
         git+https://github.com/vcmi/innoextract.git#branch=vcmi
         git+https://github.com/fuzzylite/fuzzylite.git#branch=release
+        boost-186.patch
 )
-md5sums=('SKIP' 'SKIP' 'SKIP')
+md5sums=('SKIP'
+         'SKIP'
+         'SKIP'
+         'aa22332b0b892d53ea8510c1258f8c22'
+         )

 pkgver() {
   cd "${pkgname}"
@@ -36,6 +41,10 @@ prepare() {
   git config submodule.innoextract.url "${srcdir}/innoextract"
   git config submodule.AI/FuzzyLite.url "${srcdir}/fuzzylite"
   git -c protocol.file.allow=always submodule update
+  git apply "${srcdir}/boost-186.patch"
+  # workaround for a bad clientapp/CMakeList.txt changes introduced in e15aca4d8ba1e8ef9c6a21bd38d79756ae2cd112
+  cp -r client/icons/ clientapp
+
 }

 build() {
diff --git c/boost-186.patch i/boost-186.patch
new file mode 100644
index 0000000..3096d99
--- /dev/null
+++ i/boost-186.patch
@@ -0,0 +1,58 @@
+diff --git i/client/ServerRunner.cpp w/client/ServerRunner.cpp
+index 2a7a0791e..927673fac 100644
+--- i/client/ServerRunner.cpp
++++ w/client/ServerRunner.cpp
+@@ -15,11 +15,6 @@
+ #include "../lib/CThreadHelper.h"
+ #include "../server/CVCMIServer.h"
+ 
+-#ifndef VCMI_MOBILE
+-#include <boost/process/child.hpp>
+-#include <boost/process/io.hpp>
+-#endif
+-
+ #include <future>
+ 
+ ServerThreadRunner::ServerThreadRunner() = default;
+@@ -97,7 +92,7 @@ uint16_t ServerProcessRunner::start(uint16_t port, bool connectToLobby, std::sha
+       args.push_back("--lobby");
+ 
+   std::error_code ec;
+-  child = std::make_unique<boost::process::child>(serverPath, args, ec, boost::process::std_out > logPath);
++  child = std::make_unique<boost::process::v1::child>(serverPath, args, ec, boost::process::v1::std_out > logPath);
+ 
+   if (ec)
+       throw std::runtime_error("Failed to start server! Reason: " + ec.message());
+diff --git i/client/ServerRunner.h w/client/ServerRunner.h
+index d5ba38b53..ac125e417 100644
+--- i/client/ServerRunner.h
++++ w/client/ServerRunner.h
+@@ -15,6 +15,11 @@ struct StartInfo;
+ 
+ VCMI_LIB_NAMESPACE_END
+ 
++#ifndef VCMI_MOBILE
++#include <boost/process/v1/child.hpp>
++#include <boost/process/v1/io.hpp>
++#endif
++
+ class CVCMIServer;
+ 
+ class IServerRunner
+@@ -45,15 +50,11 @@ class ServerThreadRunner : public IServerRunner, boost::noncopyable
+ 
+ #ifndef VCMI_MOBILE
+ 
+-namespace boost::process {
+-class child;
+-}
+-
+ /// Class that runs server instance as a child process
+ /// Available only on desktop systems where process management is allowed
+ class ServerProcessRunner : public IServerRunner, boost::noncopyable
+ {
+-  std::unique_ptr<boost::process::child> child;
++  std::unique_ptr<boost::process::v1::child> child;
+ 
+ public:
+   uint16_t start(uint16_t port, bool connectToLobby, std::shared_ptr<StartInfo> startingInfo) override;

After Arch update boost 1.86 vcmi-git don't build anymore.

Almost sure it need qt5-tools as makedepends, that's usually used for translation stuff

Seems like some new dependency was added upsteam, build fails with

CMake Error at /usr/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package):                                                                                                                                                                
  Could not find a package configuration file provided by "Qt5LinguistTools"                                                                                                                                                        
  with any of the following names:                                                                                                                                                                                                  

    Qt5LinguistToolsConfig.cmake                                                                                                                                                                                                    
    qt5linguisttools-config.cmake                                                                                 

  Add the installation prefix of "Qt5LinguistTools" to CMAKE_PREFIX_PATH or                                                                                                                                                         
  set "Qt5LinguistTools_DIR" to a directory containing one of the above                                                                                                                                                             
  files.  If "Qt5LinguistTools" provides a separate development package or
  SDK, be sure it has been installed.     
Call Stack (most recent call first):    
  CMakeLists.txt:515 (find_package)


-- Configuring incomplete, errors occurred!   

Might need to add qt5-tools as a build dependency?