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Suggestion:

Remove this comment:

Development is on Github: https://github.com/acxz/flightgear-arch Please open issues and PRs there instead of commenting.

since @acxz is no longer the maintainer of this package.
To not divert users to that issue tracker which might just be ignored.

Regards!

Info:

Builds also with Boost 1.80.0. I did not try other versions between 1.80.0 and 1.88.0.

Using at least 1.80.0 would make terragear buildable again:

https://gitlab.com/flightgear/terragear/-/issues/2#note_2748858724

One would need to find out the newest Boost version which simgear version 2024.1.1 builds with, and then create the appropriate boost package into the AUR and adapt simgear, flightgear and terragear-git accordingly.

Regards!

Ahoj,

to use boost174 even if another (more up to date) version of boost is installed, add -DBoost_DIR=/opt/boost-1.74.0/lib/cmake/Boost-1.74.0 to the cmake command line.

This would make the requirement mentioned in comment from 2025-08-18 obsolete.

A Patch that determines that needed directory automatically:

--- PKGBUILD.orig   2025-08-24 23:13:02.175280995 +0200
+++ PKGBUILD    2025-08-24 23:22:34.698597700 +0200
@@ -3,3 +3,3 @@
 _pkgver=2024.1.1
-pkgrel=1
+pkgrel=2
 pkgdesc="A set of open-source libraries designed to be used as building blocks for quickly assembling 3d simulations, games, and visualization applications."
@@ -14,2 +14,5 @@
 build() {
+  _boost174_version="$(pacman -Qi boost174 | grep -E '^Version[[:space:]]*:' | awk -F: '{print $2}' | sed -E -e 's|-[^-]*$||' | tr -d '[[:space:]]')"
+  _boost174_cmake_dir="$(pacman -Qql boost174 | grep -E "/lib/cmake/Boost-${_boost174_version}/$")"
+
   mv $srcdir/simgear-v${_pkgver} $srcdir/simgear
@@ -21,2 +24,3 @@
     -DENABLE_TESTS=OFF \
+    -DBoost_DIR="${_boost174_cmake_dir}" \
     ../simgear

Regards!

Note: Before building simgear, you HAVE to uninstall boost, and instead use boost174, or else it will fail to compile.

I can confirm this issue too: make[2]: [simgear/CMakeFiles/SimGearScene.dir/build.make:1826: simgear/CMakeFiles/SimGearScene.dir/scene/viewer/Compositor.cxx.o] Error 1 make[2]: Attente des tâches non terminées.... make[2]: [simgear/CMakeFiles/SimGearScene.dir/build.make:1840: simgear/CMakeFiles/SimGearScene.dir/scene/viewer/CompositorBuffer.cxx.o] Error 1 make[1]: [CMakeFiles/Makefile2:887: simgear/CMakeFiles/SimGearScene.dir/all] Error 2 make: *** [Makefile:156: all] Error 2

make[2]: [simgear/CMakeFiles/SimGearScene.dir/build.make:1826: simgear/CMakeFiles/SimGearScene.dir/scene/viewer/Compositor.cxx.o] Error 1
make[1]: [CMakeFiles/Makefile2:887: simgear/CMakeFiles/SimGearScene.dir/all] Error 2
make: *** [Makefile:156: all] Error 2

Development is on Github: https://github.com/acxz/flightgear-arch Please open issues and PRs there instead of commenting.

@gugah @onekopaka Thanks! I've pushed a fix for the compilation error.

I was able to get things building by adapting a change that was made to SimGear in its repo https://github.com/FlightGear/simgear/commit/39d616a0d591d9df6e3cab947952e140986952e6 though I ignored the style changes of the declaration to minimize the size of the diff.

Here's the diff to apply to the source:

diff --color --unified --recursive --text simgear-2020.3.4.orig/simgear/props/props.cxx simgear-2020.3.4.new/simgear/props/props.cxx
--- simgear-2020.3.4.orig/simgear/props/props.cxx       2020-12-21 20:57:57.338327502 -0800
+++ simgear-2020.3.4.new/simgear/props/props.cxx        2020-12-21 20:58:37.398237351 -0800
@@ -574,11 +574,8 @@
            int last_index = -1)
 {
   using namespace boost;
-  typedef split_iterator<typename range_result_iterator<Range>::type>
-    PathSplitIterator;

-  PathSplitIterator itr
-    = make_split_iterator(path, first_finder("/", is_equal()));
+  auto itr = make_split_iterator(path, first_finder("/", is_equal()));
   if (*path.begin() == '/')
     return find_node_aux(current->getRootNode(), itr, create, last_index);
    else

I'm getting the following error when compiling simgear 2020.3.4-1 (using up-to-date dependencies)

[ 41%] Building CXX object simgear/CMakeFiles/SimGearCore.dir/props/propertyObject.cxx.o
[ 42%] Building CXX object simgear/CMakeFiles/SimGearCore.dir/props/props.cxx.o
/tmp/yay-tmp/aur-simgear/src/simgear-2020.3.4/simgear/props/props.cxx: In function ‘SGPropertyNode* find_node(SGPropertyNode*, const Range&, bool, int)’:
/tmp/yay-tmp/aur-simgear/src/simgear-2020.3.4/simgear/props/props.cxx:577:69: error: template argument 1 is invalid
  577 |   typedef split_iterator<typename range_result_iterator<Range>::type>
      |                                                                     ^
/tmp/yay-tmp/aur-simgear/src/simgear-2020.3.4/simgear/props/props.cxx: In instantiation of ‘SGPropertyNode* find_node(SGPropertyNode*, const Range&, bool, int) [with Range = boost::iterator_range<const char*>]’:
/tmp/yay-tmp/aur-simgear/src/simgear-2020.3.4/simgear/props/props.cxx:2113:26:   required from here
/tmp/yay-tmp/aur-simgear/src/simgear-2020.3.4/simgear/props/props.cxx:581:26: error: cannot convert ‘boost::algorithm::split_iterator<const char*>’ to ‘PathSplitIterator’ {aka ‘int’} in initialization
  581 |     = make_split_iterator(path, first_finder("/", is_equal()));
      |       ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                          |
      |                          boost::algorithm::split_iterator<const char*>
make[2]: *** [simgear/CMakeFiles/SimGearCore.dir/build.make:1720: simgear/CMakeFiles/SimGearCore.dir/props/props.cxx.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:1025: simgear/CMakeFiles/SimGearCore.dir/all] Error 2
make: *** [Makefile:171: all] Error 2

I have tried the "-fpermissive" option to -DCMAKE_CXX_FLAGS in PKGBUILD for cmake with no luck.