Trying to fix small things.

configure

@@ -18872,79 +18872,12 @@ AX_BS="\\\\"
 AX_DQ="\""
 
 
-printf "// Dummy settings for cross-compile.  Configure manually.
-#define pqxx_have_concepts false
-#define pqxx_have_multidim false
-#define pqxx_have_source_location false
-#define pqxx_have_span false
-#define pqxx_have_ssize false
-#define pqxx_have_unreachable false
-" > "include/pqxx/cxx_features.hxx"
+printf "" > "include/pqxx/cxx_features.hxx"
 
 
 else $as_nop
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <fstream>
-
-int main()
-{
-    std::ofstream("include/pqxx/cxx_features.hxx") <<
-
-        // Feature test macros for libpqxx.
-        // Generated by generate_checks.py.
-
-"#define pqxx_have_concepts "
-#if defined(__cpp_concepts) && __cpp_concepts
-    "true"
-#else
-    "false"
-#endif
-"\n"
-
-"#define pqxx_have_multidim "
-#if defined(__cpp_multidimensional_subscript) && __cpp_multidimensional_subscript
-    "true"
-#else
-    "false"
-#endif
-"\n"
-
-"#define pqxx_have_source_location "
-#if defined(__cpp_lib_source_location) && __cpp_lib_source_location
-    "true"
-#else
-    "false"
-#endif
-"\n"
-
-"#define pqxx_have_span "
-#if defined(__cpp_lib_span) && __cpp_lib_span
-    "true"
-#else
-    "false"
-#endif
-"\n"
-
-"#define pqxx_have_ssize "
-#if defined(__cpp_lib_ssize) && __cpp_lib_ssize
-    "true"
-#else
-    "false"
-#endif
-"\n"
-
-"#define pqxx_have_unreachable "
-#if defined(__cpp_lib_unreachable) && __cpp_lib_unreachable
-    "true"
-#else
-    "false"
-#endif
-"\n"
-
-    << std::endl;
-}
-
 
 
 _ACEOF

configure.ac

@@ -718,8 +718,7 @@ AC_RUN_IFELSE(
 	[AC_MSG_RESULT([Generated cxx_features.hxx.])],
 	[AC_MSG_FAILURE(["C++ features check failed."])],
 	# We're cross-compiling.  Generate a dummy.
-	AX_PRINT_TO_FILE(
-		[include/pqxx/cxx_features.hxx],
+	AX_PRINT_TO_FILE([include/pqxx/cxx_features.hxx],
 		esyscmd(
 			"tools/generate_checks.py" \
 			"cxx_features.txt" \

tools/generate_checks.py

@@ -23,7 +23,7 @@
 if sys.version_info >= (3, 11):
     from datetime import UTC
 else:
-    from pytz impot UTC
+    from pytz import UTC
 endif
 
 HELP_EPILOGUE = dedent("""\