Above configuration gives:

.../jdk/src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp: In function ‘bool is_c2_compilation()’:
.../jdk/src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp:366:30: error: incomplete type ‘ciEnv’ used in nested name specifier
  366 | CompileTask* task = ciEnv::current()->task();
      | ^~~~~~~
gmake[3]: *** [lib/CompileJvm.gmk:170: .../jdk/build/linux-x86_64-server-slowdebug/hotspot/variant-server/libjvm/objs/zBarrierSetAssembler_x86.o] Error 1
gmake[3]: *** Waiting for unfinished jobs....
gmake[2]: *** [make/Main.gmk:245: hotspot-server-libs] Error 2
gmake[2]: *** Waiting for unfinished jobs....

ERROR: Build failed for targets 'clean images' in configuration 'linux-x86_64-server-slowdebug' (exit code 2)
Stopping javac server

=== Output from failing command(s) repeated here ===
* For target hotspot_variant-server_libjvm_objs_zBarrierSetAssembler_x86.o:
.../jdk/src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp: In function ‘bool is_c2_compilation()’:
.../jdk/src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp:366:30: error: incomplete type ‘ciEnv’ used in nested name specifier
  366 | CompileTask* task = ciEnv::current()->task();
      | ^~~~~~~

* All command lines available in .../jdk/build/linux-x86_64-server-slowdebug/make-support/failure-logs.
=== End of repeated output ===

No indication of failed target found.
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