In Gentoo rocm_agent_enumerator is installed by rocminfo and is in PATH.

Index: catch/CMakeLists.txt
===================================================================
--- catch.orig/CMakeLists.txt
+++ catch/CMakeLists.txt
@@ -55,9 +55,9 @@ endif()
 message(STATUS "HIP_PATH: ${HIP_PATH}")
 message(STATUS "ROCM_PATH: ${ROCM_PATH}")
 
-set(CMAKE_CXX_COMPILER "${HIP_PATH}/bin/hipcc${EXT}")
-set(CMAKE_C_COMPILER "${HIP_PATH}/bin/hipcc${EXT}")
-set(HIPCONFIG_EXECUTABLE "${HIP_PATH}/bin/hipconfig${EXT}")
+set(CMAKE_CXX_COMPILER "hipcc${EXT}")
+set(CMAKE_C_COMPILER "hipcc${EXT}")
+set(HIPCONFIG_EXECUTABLE "hipconfig${EXT}")
 execute_process(COMMAND ${HIPCONFIG_EXECUTABLE} --version
                 OUTPUT_VARIABLE HIP_VERSION
                 OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -183,9 +183,8 @@ message(STATUS "CMAKE HIP ARCHITECTURES:
 # OFFLOAD_ARCH_STR
 # rocm_agent_enumerator
 if(NOT DEFINED OFFLOAD_ARCH_STR
-   AND EXISTS "${ROCM_PATH}/bin/rocm_agent_enumerator"
    AND HIP_PLATFORM STREQUAL "amd" AND UNIX)
-    execute_process(COMMAND "${ROCM_PATH}/bin/rocm_agent_enumerator"
+    execute_process(COMMAND "rocm_agent_enumerator"
          OUTPUT_VARIABLE HIP_GPU_ARCH
          RESULT_VARIABLE ROCM_AGENT_ENUM_RESULT
          OUTPUT_STRIP_TRAILING_WHITESPACE)
Index: catch/hipTestMain/hip_test_context.cc
===================================================================
--- catch.orig/hipTestMain/hip_test_context.cc
+++ catch/hipTestMain/hip_test_context.cc
@@ -37,7 +37,7 @@ std::string TestContext::substringFound(
 
 std::string TestContext::getCurrentArch() {
 #if HT_LINUX
-  const char* cmd = "/opt/rocm/bin/rocm_agent_enumerator | sort -u | xargs | sed -e 's/ /;/g'";
+  const char* cmd = "rocm_agent_enumerator | sort -u | xargs | sed -e 's/ /;/g'";
   std::array<char, 1024> buffer;
   std::string result;
   std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);