--- CMakeLists.txt.orig	2022-07-29 16:11:55 UTC
+++ CMakeLists.txt
@@ -58,29 +58,25 @@ else(WIN32)
 
 else(WIN32)
 
-try_run(RUN_RESULT_2 COMPILE_SUCCESS_2 ${CMAKE_CURRENT_BINARY_DIR} ${config_SRCS} COMPILE_DEFINITIONS -DTEST_DECLARE_QSORT_R=ON)
-if(COMPILE_SUCCESS_2 AND (RUN_RESULT_2 EQUAL 0))
-    SET(VAR_2 0)
+try_run(RUN_RESULT_BSD_QSORT_R COMPILE_SUCCESS_BSD_QSORT_R ${CMAKE_CURRENT_BINARY_DIR} ${config_SRCS} COMPILE_DEFINITIONS -DTEST_BSD_QSORT_R=ON)
+try_run(RUN_RESULT_GNU_QSORT_R COMPILE_SUCCESS_GNU_QSORT_R ${CMAKE_CURRENT_BINARY_DIR} ${config_SRCS} COMPILE_DEFINITIONS -DTEST_GNU_QSORT_R=ON)
+if(COMPILE_SUCCESS_GNU_QSORT_R AND (RUN_RESULT_GNU_QSORT_R EQUAL 0))
+    SET(WANT_DECLARE_QSORT_R 0)
+    SET(WANT_BUNDLED_QSORT_R 0)
+    SET(WANT_SWAP_QSORT_R 1)
 else()
-    SET(VAR_2 1)
+    SET(WANT_SWAP_QSORT_R 0)
+    if(COMPILE_SUCCESS_BSD_QSORT_R AND (RUN_RESULT_BSD_QSORT_R EQUAL 0))
+        SET(WANT_DECLARE_QSORT_R 0)
+        SET(WANT_BUNDLED_QSORT_R 0)
+    else()
+        SET(WANT_DECLARE_QSORT_R 1)
+        SET(WANT_BUNDLED_QSORT_R 1)
+    endif()
 endif()
-file(APPEND "${config_FN}" "#define NEED_DECLARE_QSORT_R ${VAR_2}\n")
-
-try_run(RUN_RESULT_3 COMPILE_SUCCESS_3 ${CMAKE_CURRENT_BINARY_DIR} ${config_SRCS} COMPILE_DEFINITIONS -DTEST_QSORT_R=ON)
-if(COMPILE_SUCCESS_3 AND (RUN_RESULT_3 EQUAL 0))
-    SET(VAR_3 1)
-else()
-    SET(VAR_3 0)
-endif()
-file(APPEND "${config_FN}" "#define NEED_QSORT_R ${VAR_3}\n")
-
-try_run(RUN_RESULT_4 COMPILE_SUCCESS_4 ${CMAKE_CURRENT_BINARY_DIR} ${config_SRCS} COMPILE_DEFINITIONS -DTEST_SWAP_QSORT_R=ON)
-if(COMPILE_SUCCESS_4 AND (RUN_RESULT_4 EQUAL 0))
-    SET(VAR_4 1)
-else()
-    SET(VAR_4 0)
-endif()
-file(APPEND "${config_FN}" "#define NEED_SWAP_QSORT_R ${VAR_4}\n")
+file(APPEND "${config_FN}" "#define NEED_DECLARE_QSORT_R ${WANT_DECLARE_QSORT_R}\n")
+file(APPEND "${config_FN}" "#define NEED_SWAP_QSORT_R ${WANT_SWAP_QSORT_R}\n")
+file(APPEND "${config_FN}" "#define NEED_QSORT_R ${WANT_BUNDLED_QSORT_R}\n")
 
 endif(WIN32)