diff --git a/ChangeLog b/ChangeLog
index 7a273c8..7bbe122 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2023-08-01  André Colomb  <src@andre.colomb.de>
+
+	* Fix exit code when writing to the output image file was
+	successful.  The number of bytes written was returned and used as
+	exit code, when it should be zero on success and non-zero only on
+	error.
+	* Fix building without the custom post-processor module.  An
+	undefined reference regarding the demo --skip-checksum error would
+	otherwise fail the build.
+
+	* Release version 1.2
+
 2023-07-03  André Colomb  <src@andre.colomb.de>
 
 	* Extend the --print option to accept a "defines" format
diff --git a/configure.ac b/configure.ac
index aded967..99b3623 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# Copyright (C) 2014, 2015, 2016, 2019, 2022  Andre Colomb
+# Copyright (C) 2014, 2015, 2016, 2019, 2022, 2023  Andre Colomb
 #
 # This file is part of elf-mangle.
 #
@@ -17,7 +17,7 @@
 # <http://www.gnu.org/licenses/>.
 
 
-AC_INIT([elf-mangle],[1.1],[src@andre.colomb.de])
+AC_INIT([elf-mangle],[1.2],[src@andre.colomb.de])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([src/elf-mangle.c])
 AC_CONFIG_AUX_DIR([.])
@@ -147,7 +147,9 @@ AC_ARG_ENABLE([custom-options],
    [AS_HELP_STRING([--enable-custom-options],
        [Build extension module with custom options])],
    [AS_CASE([$enableval],
-       [yes], [custom_options=yes],
+       [yes], [custom_options=yes
+               AC_DEFINE([WITH_CUSTOM_OPTIONS], [1],
+                         [Building extension module with custom options])],
        [no],  [custom_options=no],
        [AC_MSG_ERROR([bad value ${enableval} for --enable-custom-options])])
    ],
@@ -161,7 +163,9 @@ AC_ARG_ENABLE([custom-fields],
    [AS_HELP_STRING([--enable-custom-fields],
        [Build extension module with custom known fields])],
    [AS_CASE([$enableval],
-       [yes], [custom_fields=yes],
+       [yes], [custom_fields=yes
+               AC_DEFINE([WITH_CUSTOM_FIELDS], [1],
+                         [Building extension module with custom known fields])],
        [no],  [custom_fields=no],
        [AC_MSG_ERROR([bad value ${enableval} for --enable-custom-fields])])
    ],
@@ -175,7 +179,9 @@ AC_ARG_ENABLE([custom-post-process],
    [AS_HELP_STRING([--enable-custom-post-process],
        [Build extension module with custom post-processors])],
    [AS_CASE([$enableval],
-       [yes], [custom_post_process=yes],
+       [yes], [custom_post_process=yes
+               AC_DEFINE([WITH_CUSTOM_POST_PROCESS], [1],
+                         [Building extension module with custom post-processors])],
        [no],  [custom_post_process=no],
        [AC_MSG_ERROR([bad value ${enableval} for --enable-custom-post-process])])
    ],
diff --git a/po/de.po b/po/de.po
index 13dc320..fc8b8c3 100644
--- a/po/de.po
+++ b/po/de.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: elf-mangle 0.7\n"
 "Report-Msgid-Bugs-To: src@andre.colomb.de\n"
-"POT-Creation-Date: 2023-07-03 01:23+0200\n"
+"POT-Creation-Date: 2023-08-01 11:24+0200\n"
 "PO-Revision-Date: 2023-07-03 01:25+0200\n"
 "Last-Translator: André Colomb <src@andre.colomb.de>\n"
 "Language-Team: German\n"
@@ -88,16 +88,16 @@ msgstr "NUMMER"
 msgid "Override system serial number in output"
 msgstr "System-Seriennummer in Ausgabe überschreiben"
 
-#: src/custom_options.c:72
+#: src/custom_options.c:73
 msgid "Skip CRC update post-processor"
 msgstr "Anpassung der Prüfsumme in Post-Prozessor überspringen"
 
-#: src/custom_options.c:113
+#: src/custom_options.c:115
 #, c-format
 msgid "Invalid serial number `%s' specified."
 msgstr "Ungültige Seriennummer '%s' angegeben."
 
-#: src/custom_options.c:138
+#: src/custom_options.c:142
 msgid "Example-specific options:"
 msgstr "Optionen spezifisch für Beispiel:"
 
diff --git a/src/custom_options.c b/src/custom_options.c
index eff1566..2d89d74 100644
--- a/src/custom_options.c
+++ b/src/custom_options.c
@@ -68,8 +68,10 @@ static const struct argp_option dummy_options[] =
 {
     { "set-serial",	OPT_SET_SERIAL,		N_("NUMBER"),	0,
       N_("Override system serial number in output"),		0 },
+#if WITH_CUSTOM_POST_PROCESS
     { "skip-checksum",	OPT_SKIP_CHECKSUM,	0,		0,
       N_("Skip CRC update post-processor"),			0 },
+#endif
     { 0 }
 };
 
@@ -114,9 +116,11 @@ dummy_parse_opt(
 	}
 	break;
 
+#if WITH_CUSTOM_POST_PROCESS
     case OPT_SKIP_CHECKSUM:
 	post_process_disable_checksum_update();
 	break;
+#endif
 
     default:
 	return ARGP_ERR_UNKNOWN;
diff --git a/src/elf-mangle.c b/src/elf-mangle.c
index 6151062..3828876 100644
--- a/src/elf-mangle.c
+++ b/src/elf-mangle.c
@@ -73,8 +73,9 @@ process_final_map(const tool_config* restrict config,
     if (config->image_out) r = image_write_file(
 	config->image_out, symbol_map_blob_address(map), symbol_map_blob_size(map),
 	config->format_out);
+    if (r < 0) return r;
 
-    return r;
+    return 0;
 }