diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 435a9ed..e0ddf3e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -34,10 +34,11 @@ jobs:
           cmake -S test -B build/local
           cmake --build build/local
           cmake --build build/local --target test
-          sudo -E cmake --build build/local --target install
+          sudo cmake --install build/local
 
       - name: test installed build
         run: |
+          test -e /usr/local/share/cmake/header_only-1.0/header_onlyConfig.cmake # test if header only library's CMake configs are installed to a ABI-independent dir.
           cmake -S test -B build/installed -D TEST_INSTALLED_VERSION=1
           cmake --build build/installed
           cmake --build build/installed --target test
diff --git a/.gitignore b/.gitignore
index 019dd34..0b84e72 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 /build
 /out
-/.vs
\ No newline at end of file
+/.vs
+/.cache
+/compile_commands.json
+/install_dir
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c35c56..fc90ebc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,6 +115,11 @@ function(packageProject)
 
   if(PROJECT_ARCH_INDEPENDENT)
     set(wbpvf_extra_args ARCH_INDEPENDENT)
+    # install to architecture independent (share) directory
+    set(INSTALL_DIR_FOR_CMAKE_CONFIGS ${CMAKE_INSTALL_DATADIR})
+  else()
+    # if x32 or multilib->x32 , install to (lib) directory. if x64, install to (lib64) directory
+    set(INSTALL_DIR_FOR_CMAKE_CONFIGS ${CMAKE_INSTALL_LIBDIR})
   endif()
 
   write_basic_package_version_file(
@@ -141,7 +146,7 @@ function(packageProject)
   )
 
   set("${PROJECT_NAME}_INSTALL_CMAKEDIR"
-      "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}${PROJECT_VERSION_SUFFIX}"
+      "${INSTALL_DIR_FOR_CMAKE_CONFIGS}/cmake/${PROJECT_NAME}${PROJECT_VERSION_SUFFIX}"
       CACHE PATH "CMake package config location relative to the install prefix"
   )
 
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8e406e7..9aee427 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -10,6 +10,7 @@ project(
 
 if(TEST_INSTALLED_VERSION)
   find_package(dependency 1.2 REQUIRED)
+  find_package(header_only 1.0 REQUIRED)
   find_package(namespaced_dependency 4.5.6 REQUIRED)
   find_package(transitive_dependency 7.8.9 REQUIRED)
 else()
@@ -17,6 +18,7 @@ else()
     set(CPACK_DEBIAN_PACKAGE_MAINTAINER "Foo Bar <foo@bar.local>")
   endif()
   add_subdirectory(dependency)
+  add_subdirectory(header_only)
   add_subdirectory(namespaced_dependency)
   add_subdirectory(transitive_dependency)
 endif()
@@ -24,7 +26,8 @@ endif()
 add_executable(main main.cpp)
 
 target_link_libraries(
-  main dependency ns::namespaced_dependency transitive_dependency::transitive_dependency
+  main dependency header_only ns::namespaced_dependency
+  transitive_dependency::transitive_dependency
 )
 
 enable_testing()
diff --git a/test/header_only/CMakeLists.txt b/test/header_only/CMakeLists.txt
new file mode 100644
index 0000000..1ea9aac
--- /dev/null
+++ b/test/header_only/CMakeLists.txt
@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.14...3.22)
+
+project(
+  header_only
+  VERSION 1.0
+  LANGUAGES CXX
+  DESCRIPTION "A header only dependency for testing PackageProject.cmake"
+)
+
+add_library(${PROJECT_NAME} INTERFACE)
+
+target_include_directories(
+  dependency PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+                    $<INSTALL_INTERFACE:include/${PROJECT_NAME}-${PROJECT_VERSION}>
+)
+
+add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/../.. PackageProject)
+
+packageProject(
+  NAME ${PROJECT_NAME}
+  VERSION ${PROJECT_VERSION}
+  BINARY_DIR ${PROJECT_BINARY_DIR}
+  INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
+  INCLUDE_DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
+  VERSION_HEADER "${PROJECT_NAME}/version.h"
+  DEPENDENCIES ""
+  CPACK "${TEST_CPACK}"
+)
diff --git a/test/header_only/include/header_only/adder.h b/test/header_only/include/header_only/adder.h
new file mode 100644
index 0000000..6811804
--- /dev/null
+++ b/test/header_only/include/header_only/adder.h
@@ -0,0 +1,3 @@
+#pragma once
+
+inline constexpr long add(int a, int b) { return a + b; }
diff --git a/test/main.cpp b/test/main.cpp
index dcd4ed3..b2f8c4a 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -1,5 +1,7 @@
 #include <dependency/dependency.h>
 #include <dependency/version.h>
+#include <header_only/adder.h>
+#include <header_only/version.h>
 #include <namespaced_dependency/namespaced_dependency.h>
 #include <namespaced_dependency/version.h>
 #include <transitive_dependency/transitive_dependency.h>
@@ -27,5 +29,11 @@ int main() {
   result &= TRANSITIVE_DEPENDENCY_VERSION_MINOR == 8;
   result &= TRANSITIVE_DEPENDENCY_VERSION_PATCH == 9;
   result &= TRANSITIVE_DEPENDENCY_VERSION_TWEAK == 21948124;
+  result &= (5 == add(2, 3));
+  result &= HEADER_ONLY_VERSION == std::string("1.0");
+  result &= HEADER_ONLY_VERSION_MAJOR == 1;
+  result &= HEADER_ONLY_VERSION_MINOR == 0;
+  result &= HEADER_ONLY_VERSION_PATCH == 0;
+  result &= HEADER_ONLY_VERSION_TWEAK == 0;
   return result ? 0 : 1;
 }