This is already committed in kde overlay for testing (e.g. via eclass-
overrides).

Bug: https://bugs.gentoo.org/920845
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>
---
 eclass/cmake.eclass | 1 +
 1 file changed, 1 insertion(+)

diff --git a/eclass/cmake.eclass b/eclass/cmake.eclass
index c29dcfe413..f4a0d6506c 100644
--- a/eclass/cmake.eclass
+++ b/eclass/cmake.eclass
@@ -459,6 +459,7 @@ cmake_src_configure() {
 		set(BUILD_SHARED_LIBS ON CACHE BOOL "")
 		set(Python3_FIND_UNVERSIONED_NAMES FIRST CACHE STRING "")
 		set(FETCHCONTENT_FULLY_DISCONNECTED ON CACHE BOOL "")
+		set(CMAKE_DISABLE_PRECOMPILE_HEADERS ON CACHE BOOL "")
 	_EOF_
 
 	if [[ -n ${_ECM_ECLASS} ]]; then
-- 
2.43.0