diff --git a/srcpkgs/libclc/template b/srcpkgs/libclc/template
index da85a23c785..5bf88b564d9 100644
--- a/srcpkgs/libclc/template
+++ b/srcpkgs/libclc/template
@@ -1,10 +1,10 @@
 # Template file for 'libclc'
 pkgname=libclc
 version=18.1.8
-revision=1
+revision=2
 build_style=cmake
 # disable clspv (failing tests, we don't ship it)
-configure_args="-DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release
+configure_args="-DCMAKE_INSTALL_PREFIX=/usr/lib/llvm/18/ -DCMAKE_BUILD_TYPE=Release
  -DLIBCLC_TARGETS_TO_BUILD=amdgcn--;amdgcn--amdhsa;r600--;nvptx--;nvptx64--;nvptx--nvidiacl;nvptx64--nvidiacl;spirv-mesa3d-;spirv64-mesa3d-"
 hostmakedepends="llvm18-devel python3 libedit-devel libffi-devel
  ncurses-devel zlib-devel SPIRV-LLVM-Translator"
@@ -16,6 +16,12 @@ distfiles="https://github.com/llvm/llvm-project/releases/download/llvmorg-${vers
 checksum=905bd59e9f810d6bd0ae6874725a8f8a3c91cb416199c03f2b98b57437cfb32e
 replaces="libclc-git>=0"
 
+alternatives="
+ clc:/usr/share/clc:/usr/lib/llvm/18/share/clc
+ clc:/usr/include/clc:/usr/lib/llvm/18/include/clc
+ clc:/usr/share/pkgconfig/libclc.pc:/usr/lib/llvm/18/share/pkgconfig/libclc.pc
+"
+
 do_configure() {
 	# We really do a native build.
 	# The outcome is just header files.