diff --git a/dist/ubuntu-env.sh b/dist/ubuntu-env.sh
index 837c68a..170222b 100755
--- a/dist/ubuntu-env.sh
+++ b/dist/ubuntu-env.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-export HHVERSION="1.9.1"
+export HHVERSION="1.9.10"
 export HHFULLVERSION=${HHVERSION}-0ubuntu1
 export HH=hh_${HHVERSION}
 export HHRELEASE=hh_${HHFULLVERSION}
@@ -9,10 +9,10 @@ export NOW=`date +%Y-%m-%d--%H-%M-%S`
 export HHBUILD=hstr-${NOW}
 
 ## https://wiki.ubuntu.com/Releases
-export UBUNTUVERSION=precise
+#export UBUNTUVERSION=precise
 #export UBUNTUVERSION=quantal
 #export UBUNTUVERSION=saucy
-#export UBUNTUVERSION=trusty
+export UBUNTUVERSION=trusty
 
 export HHBZRMSG="Favorites - favorite commands can be bookmarked and shown in a new view!"
 
diff --git a/src/hstr_favorites.c b/src/hstr_favorites.c
index 0a0fc4e..39a39b6 100644
--- a/src/hstr_favorites.c
+++ b/src/hstr_favorites.c
@@ -11,12 +11,12 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+
 #include "include/hstr_favorites.h"
+#include "include/hstr_utils.h"
 
 #define FAVORITE_SEGMENT_SIZE 10
 
-extern char *strdup(const char *s);
-
 void favorites_init(FavoriteItems *favorites)
 {
 	favorites->items=NULL;
@@ -68,7 +68,7 @@ void favorites_get(FavoriteItems *favorites)
 				while(pe!=NULL) {
 					favorites->items[i]=pb;
 					*pe=0;
-					favorites->items[i]=(char *)strdup(pb);
+					favorites->items[i]=hstr_strdup(pb);
 					pb=pe+1;
 					pe=strchr(pb, '\n');
 					i++;
@@ -115,11 +115,11 @@ void favorites_add(FavoriteItems *favorites, char *newFavorite)
 {
 	if(favorites->count) {
 		favorites->items=realloc(favorites->items, sizeof(char *) * ++favorites->count);
-		favorites->items[favorites->count-1]=strdup(newFavorite);
+		favorites->items[favorites->count-1]=hstr_strdup(newFavorite);
 		favorites_choose(favorites, newFavorite);
 	} else {
 		favorites->items=malloc(sizeof(char*));
-		favorites->items[0]=strdup(newFavorite);
+		favorites->items[0]=hstr_strdup(newFavorite);
 		favorites->count=1;
 	}
 
diff --git a/src/hstr_utils.c b/src/hstr_utils.c
index 7346be8..0589f74 100644
--- a/src/hstr_utils.c
+++ b/src/hstr_utils.c
@@ -8,11 +8,21 @@
 */
 
 #include "include/hstr_utils.h"
+
 #include <ctype.h>
 
 #define DEFAULT_COMMAND "pwd"
 #define PROC_HOSTNAME "/proc/sys/kernel/hostname"
 
+// strdup() not in ISO C
+char *hstr_strdup(const char * s)
+{
+  size_t len = 1+strlen(s);
+  char *p = malloc(len);
+
+  return p ? memcpy(p, s, len) : NULL;
+}
+
 void tiocsti()
 {
 	char buf[] = DEFAULT_COMMAND;
diff --git a/src/include/hstr_utils.h b/src/include/hstr_utils.h
index a4c7d48..2fd7a94 100644
--- a/src/include/hstr_utils.h
+++ b/src/include/hstr_utils.h
@@ -20,6 +20,7 @@
 #define MIN(a,b) (((a)<(b))?(a):(b))
 #define MAX(a,b) (((a)>(b))?(a):(b))
 
+char *hstr_strdup(const char * s);
 void tiocsti();
 void fill_terminal_input(char* cmd, bool padding);
 void reverse_char_pointer_array(char **array, unsigned length);
diff --git a/tests/src/test_hashset.c b/tests/src/test_hashset.c
index 6676938..4e6f70a 100644
--- a/tests/src/test_hashset.c
+++ b/tests/src/test_hashset.c
@@ -8,6 +8,7 @@
 */
 
 #include "../src/include/hashset.h"
+#include "../src/include/hstr_utils.h"
 
 void testBlacklist() {
 	const char* commandBlacklist[] = { };
@@ -19,7 +20,7 @@ void testBlacklist() {
 	}
 	for (i = 0; i < 5; i++) {
 		printf("match %d\n",
-				hashset_contains(&blacklist, strdup(commandBlacklist[i])));
+				hashset_contains(&blacklist, hstr_strdup(commandBlacklist[i])));
 	}
 }