Taken from https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/llvm-roc/files

diff -Naur a/clang/lib/Basic/CMakeLists.txt b/clang/lib/Basic/CMakeLists.txt
--- a/clang/lib/Basic/CMakeLists.txt	2019-12-28 07:42:49.119055933 +0100
+++ b/clang/lib/Basic/CMakeLists.txt	2019-12-28 07:42:13.265056070 +0100
@@ -2,6 +2,7 @@
   Core
   MC
   Support
+  Option
   )
 
 find_first_existing_vc_file("${LLVM_MAIN_SRC_DIR}" llvm_vc)
diff -Naur a/clang/lib/Driver/CMakeLists.txt b/clang/lib/Driver/CMakeLists.txt
--- a/clang/lib/Driver/CMakeLists.txt	2019-12-28 07:41:39.521056199 +0100
+++ b/clang/lib/Driver/CMakeLists.txt	2019-12-28 07:40:23.998056487 +0100
@@ -79,4 +79,5 @@
   LINK_LIBS
   clangBasic
   ${system_libs}
+  pthread
   )
n>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<div class='path'>path: <a href='/guix/log/?id=8448e0befa18d5e34d44c320a092994e9fac388f'>root</a>/<a href='/guix/log/m4?id=8448e0befa18d5e34d44c320a092994e9fac388f'>m4</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/m4?id=8448e0befa18d5e34d44c320a092994e9fac388f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-11-07 18:07:11 +0200'>2023-11-07</span></td><td><a href='/guix/commit/m4?id=220759226e93d76d8d80058f69f9d8b29714bbde'>build: Fix spelling in m4 macros.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-03-16 12:37:03 +0100'>2023-03-16</span></td><td><a href='/guix/commit/m4?id=8e3dfb3d6dfc0f19bd9a9f9b163f0f3d7dccc865'>build: Correct guix_system on musl libc distros.</a><span class='msg-avail'>...</span></td><td>Antero Mejr</td></tr>