--- a/Resources/CMake/UnixOdbcConfiguration.cmake	Wed Aug 11 08:00:46 2021 +0200
+++ b/Resources/CMake/UnixOdbcConfiguration.cmake	Wed Aug 11 08:28:43 2021 +0200
@@ -50,6 +50,22 @@
       ${UNIX_ODBC_SOURCES_DIR}/libltdl/ltdl.c
       ${UNIX_ODBC_SOURCES_DIR}/libltdl/slist.c
       )
+
+    if (${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
+      set(OSXHEADER 1)
+      set(__error_t_defined 1)
+      set(error_t int)
+
+      # NB: The lines below might also be used for compatibility with
+      # LSB target version 4.0 instead of 5.0 (untested)
+      configure_file(
+        ${UNIX_ODBC_SOURCES_DIR}/libltdl/libltdl/lt__argz_.h
+        ${UNIX_ODBC_SOURCES_DIR}/libltdl/libltdl/lt__argz.h
+        COPYONLY)
+      list(APPEND LTDL_SOURCES
+        ${UNIX_ODBC_SOURCES_DIR}/libltdl/lt__argz.c
+        )
+    endif()
   else()
     check_include_file("libltdl/lt_dlloader.h"  HAVE_LT_DLLOADER_H)
     if (NOT HAVE_LT_DLLOADER_H)

--- a/Resources/Odbc/config.h.in	Wed Aug 11 08:00:46 2021 +0200
+++ b/Resources/Odbc/config.h.in	Wed Aug 11 08:28:43 2021 +0200
@@ -489,13 +489,13 @@
 #cmakedefine _THREAD_SAFE
 
 /* Define so that glibc/gnulib argp.h does not typedef error_t. */
-#cmakedefine __error_t_defined
+#cmakedefine __error_t_defined @__error_t_defined@
 
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
 
 /* Define to a type to use for 'error_t' if it is not otherwise available. */
-#undef error_t
+#cmakedefine error_t @error_t@
 
 /* Define to `int' if <sys/types.h> doesn't define. */
 #undef gid_t