diff --git a/src/auto/configure b/src/auto/configure
index 2f3b1dc..9d7a719 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -5435,7 +5435,7 @@
   $as_echo_n "(cached) " >&6
 else
   vi_cv_var_python3_version=`
-          ${vi_cv_path_python3} -c 'import sys; print(sys.version[1:3])'`
+          ${vi_cv_path_python3} -c 'import sys; print(sys.version[:3])'`
 
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $vi_cv_var_python3_version" >&5
@@ -5493,7 +5493,7 @@
      vi_cv_path_python3_conf=
      for path in "${vi_cv_path_python3_pfx}" "${vi_cv_path_python3_epfx}"; do
        for subdir in lib share; do
-         d="${path}/${subdir}/python3${vi_cv_var_python3_version}/config"
+         d="${path}/${subdir}/python${vi_cv_var_python3_version}/config"
          if test -d "$d" && test -f "$d/config.c"; then
            vi_cv_path_python3_conf="$d"
          fi
@@ -5519,15 +5519,15 @@
           tmp_mkf="$pwd/config-PyMake$$"
           cat -- "${PYTHON3_CONFDIR}/Makefile" - <<'eof' >"${tmp_mkf}"
 __:
-	@echo "python3_MODLIBS='$(MODLIBS)'"
+	@echo "python3_BASEMODLIBS='$(BASEMODLIBS)'"
 	@echo "python3_LIBS='$(LIBS)'"
 	@echo "python3_SYSLIBS='$(SYSLIBS)'"
 	@echo "python3_LINKFORSHARED='$(LINKFORSHARED)'"
 eof
                     eval "`cd ${PYTHON3_CONFDIR} && make -f "${tmp_mkf}" __ | sed '/ directory /d'`"
           rm -f -- "${tmp_mkf}"
-          vi_cv_path_python3_plibs="-L${PYTHON3_CONFDIR} -lpython3${vi_cv_var_python3_version}"
-          vi_cv_path_python3_plibs="${vi_cv_path_python3_plibs} ${python3_MODLIBS} ${python3_LIBS} ${python3_SYSLIBS} ${python3_LINKFORSHARED}"
+          vi_cv_path_python3_plibs="-L${PYTHON3_CONFDIR} -lpython${vi_cv_var_python3_version}"
+          vi_cv_path_python3_plibs="${vi_cv_path_python3_plibs} ${python3_BASEMODLIBS} ${python3_LIBS} ${python3_SYSLIBS} ${python3_LINKFORSHARED}"
                     vi_cv_path_python3_plibs=`echo $vi_cv_path_python3_plibs | sed s/-ltermcap//`
           vi_cv_path_python3_plibs=`echo $vi_cv_path_python3_plibs | sed s/-lffi//`
 
@@ -5536,9 +5536,9 @@
 
       PYTHON3_LIBS="${vi_cv_path_python3_plibs}"
       if test "${vi_cv_path_python3_pfx}" = "${vi_cv_path_python3_epfx}"; then
-        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python3${vi_cv_var_python3_version}"
+        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python${vi_cv_var_python3_version}"
       else
-        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python3${vi_cv_var_python3_version} -I${vi_cv_path_python3_epfx}/include/python3${vi_cv_var_python3_version}"
+        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python${vi_cv_var_python3_version} -I${vi_cv_path_python3_epfx}/include/python${vi_cv_var_python3_version}"
       fi
       PYTHON3_SRC="if_python3.c"
             if test "x$MACOSX" = "xyes"; then
@@ -5649,7 +5649,7 @@
   PYTHON_LIBS=
   PYTHON3_SRC="if_python3.c"
   PYTHON3_OBJ="objects/if_python3.o"
-  PYTHON3_CFLAGS="$PYTHON3_CFLAGS -DDYNAMIC_PYTHON3_DLL=\\\"libpython3${vi_cv_var_python3_version}.so\\\""
+  PYTHON3_CFLAGS="$PYTHON3_CFLAGS -DDYNAMIC_PYTHON3_DLL=\\\"libpython${vi_cv_var_python3_version}.so\\\""
   PYTHON3_LIBS=
 fi
 
diff --git a/src/configure.in b/src/configure.in
index 6a2b9d2..112f8a6 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -929,7 +929,7 @@
     dnl -- get its version number
     AC_CACHE_CHECK(Python version,vi_cv_var_python3_version,
     [[vi_cv_var_python3_version=`
-          ${vi_cv_path_python3} -c 'import sys; print(sys.version[1:3])'`
+          ${vi_cv_path_python3} -c 'import sys; print(sys.version[:3])'`
     ]])
 
     dnl -- find where python3 thinks it was installed
@@ -963,7 +963,7 @@
      vi_cv_path_python3_conf=
      for path in "${vi_cv_path_python3_pfx}" "${vi_cv_path_python3_epfx}"; do
        for subdir in lib share; do
-         d="${path}/${subdir}/python3${vi_cv_var_python3_version}/config"
+         d="${path}/${subdir}/python${vi_cv_var_python3_version}/config"
          if test -d "$d" && test -f "$d/config.c"; then
            vi_cv_path_python3_conf="$d"
          fi
@@ -985,7 +985,7 @@
           tmp_mkf="$pwd/config-PyMake$$"
           cat -- "${PYTHON3_CONFDIR}/Makefile" - <<'eof' >"${tmp_mkf}"
 __:
-	@echo "python3_MODLIBS='$(MODLIBS)'"
+	@echo "python3_BASEMODLIBS='$(BASEMODLIBS)'"
 	@echo "python3_LIBS='$(LIBS)'"
 	@echo "python3_SYSLIBS='$(SYSLIBS)'"
 	@echo "python3_LINKFORSHARED='$(LINKFORSHARED)'"
@@ -993,8 +993,8 @@
           dnl -- delete the lines from make about Entering/Leaving directory
           eval "`cd ${PYTHON3_CONFDIR} && make -f "${tmp_mkf}" __ | sed '/ directory /d'`"
           rm -f -- "${tmp_mkf}"
-          vi_cv_path_python3_plibs="-L${PYTHON3_CONFDIR} -lpython3${vi_cv_var_python3_version}"
-          vi_cv_path_python3_plibs="${vi_cv_path_python3_plibs} ${python3_MODLIBS} ${python3_LIBS} ${python3_SYSLIBS} ${python3_LINKFORSHARED}"
+          vi_cv_path_python3_plibs="-L${PYTHON3_CONFDIR} -lpython${vi_cv_var_python3_version}"
+          vi_cv_path_python3_plibs="${vi_cv_path_python3_plibs} ${python3_BASEMODLIBS} ${python3_LIBS} ${python3_SYSLIBS} ${python3_LINKFORSHARED}"
           dnl remove -ltermcap, it can conflict with an earlier -lncurses
           vi_cv_path_python3_plibs=`echo $vi_cv_path_python3_plibs | sed s/-ltermcap//`
           vi_cv_path_python3_plibs=`echo $vi_cv_path_python3_plibs | sed s/-lffi//`
@@ -1002,9 +1002,9 @@
 
       PYTHON3_LIBS="${vi_cv_path_python3_plibs}"
       if test "${vi_cv_path_python3_pfx}" = "${vi_cv_path_python3_epfx}"; then
-        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python3${vi_cv_var_python3_version}"
+        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python${vi_cv_var_python3_version}"
       else
-        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python3${vi_cv_var_python3_version} -I${vi_cv_path_python3_epfx}/include/python3${vi_cv_var_python3_version}"
+        PYTHON3_CFLAGS="-I${vi_cv_path_python3_pfx}/include/python${vi_cv_var_python3_version} -I${vi_cv_path_python3_epfx}/include/python${vi_cv_var_python3_version}"
       fi
       PYTHON3_SRC="if_python3.c"
       dnl For Mac OSX 10.2 config.o is included in the Python library.
@@ -1088,7 +1088,7 @@
   PYTHON_LIBS=
   PYTHON3_SRC="if_python3.c"
   PYTHON3_OBJ="objects/if_python3.o"
-  PYTHON3_CFLAGS="$PYTHON3_CFLAGS -DDYNAMIC_PYTHON3_DLL=\\\"libpython3${vi_cv_var_python3_version}.so\\\""
+  PYTHON3_CFLAGS="$PYTHON3_CFLAGS -DDYNAMIC_PYTHON3_DLL=\\\"libpython${vi_cv_var_python3_version}.so\\\""
   PYTHON3_LIBS=
 fi