# Pastebin ddhylbul
===>  Building for crystal-1.15.1
Using /usr/local/bin/llvm-config20 [version=20.1.0]
CRYSTAL_CONFIG_BUILD_COMMIT="84f389ac5424" CRYSTAL_CONFIG_PATH=lib:/usr/local/lib/crystal SOURCE_DATE_EPOCH="1738627200"  CRYSTAL_CONFIG_LIBRARY_PATH='$ORIGIN/../lib/crystal' ./bin/crystal build --progress --stats --threads 16 --release --no-debug -D strict_multi_assign -D preview_overload_order --link-flags="  -fstack-protector-strong "  -o .build/crystal src/compiler/crystal.cr -D without_openssl -D without_zlib -D use_pcre2
Using compiled compiler at .build/crystal
Parse:                             00:00:00.000035216 (   1.08MB)
Semantic (top level):              00:00:00.700791860 ( 186.13MB)
Semantic (new):                    00:00:00.003690114 ( 186.13MB)
Semantic (type declarations):      00:00:00.062277770 ( 194.13MB)
Semantic (abstract def check):     00:00:00.021439260 ( 218.13MB)
Semantic (restrictions augmenter): 00:00:00.022813522 ( 218.13MB)
Showing last frame. Use --error-trace for full trace.

There was a problem expanding macro 'macro_35929073856'

Code in src/gc/boehm.cr:420:3

 420 | {% if flag?(:preview_mt) %}
       ^
Called macro defined in src/gc/boehm.cr:420:3

 420 | {% if flag?(:preview_mt) %}

Which expanded to:

 > 2 | # support for legacy gc releases
 > 3 | def self.set_stackbottom(stack_bottom : Void*)
 > 4 |   LibGC.stackbottom = stack_bottom
               ^----------
Error: undefined fun 'stackbottom=' for LibGC
gmake: *** [Makefile:246: .build/crystal] Error 1
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure to
the maintainer.
*** Error code 1