diff --git a/debian/changelog b/debian/changelog
index 6f1015ea..720513c7 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,7 +4,11 @@ llvm-toolchain-18 (1:18.1.0~rc2-4) UNRELEASED; urgency=medium
   * Install *clang_rt* on sparc and sparc64
   * Run chrpath for libclang on sparc and sparc64
 
- -- John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>  Fri, 16 Feb 2024 09:53:15 +0100
+  [ Sylvestre Ledru ]
+  * add -DLIBCXX_INSTALL_MODULES=ON
+    see https://discourse.llvm.org/t/libc-c-23-module-installation-support/77061/1
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Sun, 18 Feb 2024 22:32:30 +0100
 
 llvm-toolchain-18 (1:18.1.0~rc2-3) unstable; urgency=medium
 
diff --git a/debian/rules b/debian/rules
index a5820140..89269eb6 100755
--- a/debian/rules
+++ b/debian/rules
@@ -781,6 +781,7 @@ endif
 	-DLIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY=ON \
 	-DLIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY=OFF \
 	-DLIBCXX_INSTALL_LIBRARY=OFF \
+	-DLIBCXX_INSTALL_MODULES=ON \
 	-DOPENMP_ENABLE_LIBOMP_PROFILING=OFF \
 	-DOPENMP_ENABLE_LIBOMPTARGET_PROFILING=OFF \
 	-DLIBOMP_ENABLE_RTTI=OFF \