diff -Naur "IPAddress-5 (copy).2.1/IPAddress/build.xml" IPAddress-5.2.1/IPAddress/build.xml
--- "IPAddress-5 (copy).2.1/IPAddress/build.xml"	2020-01-05 20:37:56.000000000 +0100
+++ IPAddress-5.2.1/IPAddress/build.xml	2020-05-09 12:15:11.862632738 +0200
@@ -66,7 +66,7 @@
 		<!-- first compile entirely as java 9 to ensure compliance with module configuration -->
 		<echo message="compiling as Java 9"/>
 		<javac srcdir="${src_location}" destdir="${bin_location}" debug="on"
-				source="9" target="9" failonerror="false" verbose="false" createMissingPackageInfoClass="false">
+				source="9" target="9" failonerror="true" verbose="false" createMissingPackageInfoClass="false">
 			<include name="${rootPackagePath}/**/*.java"/>
 		</javac>
 		<!-- compile as java 8, excluding module-info.java, and leave the existing java 9 module-info -->
@@ -78,7 +78,7 @@
     	</delete>
 		<echo message="compiling as Java 8"/>
 		<javac srcdir="${src_location}" destdir="${bin_location}" debug="on"
-				source="1.8" target="1.8" failonerror="false" verbose="false" createMissingPackageInfoClass="false"
+				source="1.8" target="1.8" failonerror="true" verbose="false" createMissingPackageInfoClass="false"
 				deprecation="true">
 			<include name="${rootPackagePath}/**/*.java"/>
 			<exclude name="${rootPackagePath}/module-info.java"/>
diff -Naur "IPAddress-5 (copy).2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/Address.java" IPAddress-5.2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/Address.java
--- "IPAddress-5 (copy).2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/Address.java"	2020-01-05 20:37:56.000000000 +0100
+++ IPAddress-5.2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/Address.java	2020-05-09 12:09:18.862920529 +0200
@@ -65,11 +65,11 @@
 	public static final String OCTAL_PREFIX = "0";
 	public static final char RANGE_SEPARATOR = '-';
 	public static final String RANGE_SEPARATOR_STR = String.valueOf(RANGE_SEPARATOR);
-	public static final char ALTERNATIVE_RANGE_SEPARATOR = '\u00bb'; //'»'; javadoc whines about this char
+	public static final char ALTERNATIVE_RANGE_SEPARATOR = '\u00bb';
 	public static final String ALTERNATIVE_RANGE_SEPARATOR_STR = String.valueOf(ALTERNATIVE_RANGE_SEPARATOR);
 	public static final char SEGMENT_WILDCARD = '*';
 	public static final String SEGMENT_WILDCARD_STR = String.valueOf(SEGMENT_WILDCARD);
-	public static final String ALTERNATIVE_SEGMENT_WILDCARD_STR = "¿";
+	public static final String ALTERNATIVE_SEGMENT_WILDCARD_STR = "\u00bf";
 	public static final char SEGMENT_SQL_WILDCARD = '%';
 	public static final String SEGMENT_SQL_WILDCARD_STR = String.valueOf(SEGMENT_SQL_WILDCARD);
 	public static final char SEGMENT_SQL_SINGLE_WILDCARD = '_';
diff -Naur "IPAddress-5 (copy).2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv4/IPv4Address.java" IPAddress-5.2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv4/IPv4Address.java
--- "IPAddress-5 (copy).2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv4/IPv4Address.java"	2020-01-05 20:37:56.000000000 +0100
+++ IPAddress-5.2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv4/IPv4Address.java	2020-05-09 12:10:21.052566750 +0200
@@ -1080,7 +1080,7 @@
 	public boolean isPrivate() {
 		// refer to RFC 1918
         // 10/8 prefix
-        // 172.16/12 prefix (172.16.0.0 – 172.31.255.255)
+        // 172.16/12 prefix (172.16.0.0 - 172.31.255.255)
         // 192.168/16 prefix
 		IPv4AddressSegment seg0 = getSegment(0);
 		IPv4AddressSegment seg1 = getSegment(1);
diff -Naur "IPAddress-5 (copy).2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv6/IPv6Address.java" IPAddress-5.2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv6/IPv6Address.java
--- "IPAddress-5 (copy).2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv6/IPv6Address.java"	2020-01-05 20:37:56.000000000 +0100
+++ IPAddress-5.2.1/IPAddress/src/inet.ipaddr/inet/ipaddr/ipv6/IPv6Address.java	2020-05-09 12:10:55.087925589 +0200
@@ -94,7 +94,7 @@
 
 	public static final char SEGMENT_SEPARATOR = ':';
 	public static final char ZONE_SEPARATOR = '%';
-	public static final char ALTERNATIVE_ZONE_SEPARATOR = '\u00a7';//'§'; javadoc whines about this char 
+	public static final char ALTERNATIVE_ZONE_SEPARATOR = '\u00a7';
 
 	public static final char UNC_SEGMENT_SEPARATOR = '-';
 	public static final char UNC_ZONE_SEPARATOR = 's';