New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/issues/17935#issuecomment-767850281

Comment:
I think what you want is

```diff
diff --git a/srcpkgs/llvm11/template b/srcpkgs/llvm11/template
index 12ecb4bdc4..6746ed6644 100644
--- a/srcpkgs/llvm11/template
+++ b/srcpkgs/llvm11/template
@@ -11,7 +11,9 @@ configure_args="
  -DLLVM_LINK_LLVM_DYLIB=ON
  -DLLVM_ENABLE_RTTI=ON
  -DLLVM_ENABLE_FFI=ON
- -DLLVM_BINUTILS_INCDIR=/usr/include"
+ -DLLVM_BINUTILS_INCDIR=/usr/include
+ -DLLVM_INCLUDE_DOCS=ON
+ -DLLVM_BUILD_DOCS=ON"
 hostmakedepends="groff perl python3 zlib-devel libffi-devel swig"
 makedepends="python3-devel zlib-devel libffi-devel libedit-devel
  libxml2-devel binutils-devel libatomic-devel"
```