--- ./configure.ac.ORIGIN	2021-01-13 13:42:45 +0100
+++ ./configure.ac	2021-01-13 15:04:36 +0100
@@ -787,7 +787,13 @@
     fi
   else
     PYTHON3="$PY3BIN"
-    AC_CHECK_PROGS(PY3CONFIG, [$PYTHON3-config])
+    case $host in
+      *-*-aix*)
+                # Handle: python3-config python3-config_32 python3-config_64
+                PYTHON3_3264=`echo $PYTHON3 | awk -F_ '{if(NF==2)print "_" $2}'`
+                AC_CHECK_PROGS(PY3CONFIG, [python3-config$PYTHON3_3264]);;
+      *)        AC_CHECK_PROGS(PY3CONFIG, [$PYTHON3-config]);;
+    esac
   fi
 
   if test -n "$PYTHON3"; then