diff --git a/Makefile b/Makefile
index 514b753..096caa1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 BEE_VERSION = 1.2.24
 
 CC=gcc
-CFLAGS=-Wall -g
+CFLAGS=-Wall -Wextra -Wno-override-init -Werror -g -O3
 LDFLAGS=
 
 PREFIX     = /usr
diff --git a/src/bee_version_compare.c b/src/bee_version_compare.c
index 43824b8..6514fe8 100644
--- a/src/bee_version_compare.c
+++ b/src/bee_version_compare.c
@@ -28,86 +28,40 @@
 
 #include "bee_version.h"
 
-int compare_version_strings(char *v1, char *v2) {
-    char *a, *b;
-    long long i,j;
 
-    assert(v1);
-    assert(v2);
-
-    a = v1;
-    b = v2;
-
-    while(*a && *b && *a == *b) {
-        a++;
-        b++;
-
-        if (*a == *b)
+// '2.23.2'    >  '2.23.0'
+//' 2.23.10'   >  '2.23.8'
+// '2.23.001'  == '2.23.1'
+// '2.23.1001' >  '2.23.101'
+
+static int compare_version_strings(char *a, char *b) {
+    while (1) {
+
+        if (isdigit(*a) && isdigit (*b)) {
+            long i_a = atoll(a);
+            long i_b = atoll(b);
+            if (i_a < i_b)
+                return -1;
+            if (i_a > i_b)
+                return 1;
+            while(isdigit(*a))
+                a++;
+            while(isdigit(*b))
+                b++;
             continue;
-
-        /* skip leading zeros of numbers != 0 */
-        if (isdigit(*a) && isdigit(*b)) {
-            char *c;
-
-            for (c=a; *c == '0'; c++)
-               ;
-            if (isdigit(*c))
-               a = c;
-
-            for (c=b; *c == '0'; c++)
-               ;
-            if (isdigit(*c))
-               b = c;
-        }
-    }
-
-    /* strings are equal ; *a==*b==0*/
-    if(*a == *b)
-        return(0);
-
-    if(isdigit(*a)) {
-        if(isdigit(*b)) {
-            /* rewind string to first digit */
-            /* e.g. to compare 12 vs 100 and not 2 vs 00 */
-            while(a > v1 && isdigit(*(a-1)) &&
-                  b > v2 && isdigit(*(b-1))) {
-                a--;
-                b--;
-            }
-            i = atoll(a);
-            j = atoll(b);
-
-            if(i<j)
-                return(-1);
-            if(i>j)
-                return(1);
-
-            /* numbers are equal but strings are not?           */
-            /* yes ->  leading zeros: atoll("01") == atoll("1") */
-            return(0);
         }
-        /* a > ('.',alpha, 0) */
-        return(1);
-    }
 
-    if(isalpha(*a)) {
+        if (*a < *b)
+            return -1;
+        if (*a > *b)
+            return 1;
 
-        /*  alpha < digit */
-        if(isdigit(*b))
-            return(-1);
+        if (*a == '\0')  // implies *b == '\0', too
+            return 0;
 
-        if(isalpha(*b)) {
-            if(*a < *b)
-                return(-1);
-            return(1);
-        }
-        return(1);
+        a++;
+        b++;
     }
-
-    if(! *b)
-        return(1);
-
-    return(-1);
 }
 
 int compare_beepackage_names(struct beeversion *v1, struct beeversion *v2) {
diff --git a/src/bee_version_compare.h b/src/bee_version_compare.h
index 5af38ef..3a333fb 100644
--- a/src/bee_version_compare.h
+++ b/src/bee_version_compare.h
@@ -24,7 +24,6 @@
 
 #include "bee_version.h"
 
-int compare_version_strings(char *v1, char *v2);
 int compare_beepackage_names(struct beeversion *v1, struct beeversion *v2);
 int compare_beeversions(struct beeversion *v1, struct beeversion *v2);
 int compare_beepackages(struct beeversion *v1, struct beeversion *v2);
diff --git a/src/bee_version_output.c b/src/bee_version_output.c
index aa67df5..26443ac 100644
--- a/src/bee_version_output.c
+++ b/src/bee_version_output.c
@@ -156,6 +156,7 @@ void print_format(char* s, struct beeversion *v, char *filter_pkgfullname)
                         p++;
                         continue;
                   }
+                  // fall through
                 default:
                     printf("%%%c", *p);
                     break;
diff --git a/src/beeflock.c b/src/beeflock.c
index f663a0f..95bcb1a 100644
--- a/src/beeflock.c
+++ b/src/beeflock.c
@@ -66,7 +66,7 @@ void usage(void)
 #define BEEFLOCK_UNLOCK     LOCK_UN
 #define BEEFLOCK_NOBLOCK    LOCK_NB
 
-int bee_flock_fd(int fd, int operation, int flags)
+int bee_flock_fd(int fd, int operation)
 {
     int res;
 
@@ -123,7 +123,7 @@ int bee_flock_close(int fd)
     return res;
 }
 
-int bee_flock(char *filename, int operation, int flags)
+int bee_flock(char *filename, int operation)
 {
     int res;
     int fd, fd2;
@@ -134,7 +134,7 @@ int bee_flock(char *filename, int operation, int flags)
         return -1;
 
     while (1) {
-        res = bee_flock_fd(fd, operation, 0);
+        res = bee_flock_fd(fd, operation);
         if (res < 0)
             return -1;
 
@@ -169,7 +169,7 @@ int bee_flock(char *filename, int operation, int flags)
 }
 
 
-int bee_execute_command(char *command[], int flags)
+int bee_execute_command(char *command[])
 {
     pid_t fpid, wpid;
     int wstatus;
@@ -265,12 +265,12 @@ int main(int argc, char *argv[])
         BEE_EXIT(OSERR);
     }
 
-    fd = bee_flock(lockfilename, operation, 0);
+    fd = bee_flock(lockfilename, operation);
     if (fd < 0) {
         BEE_EXIT(SOFTWARE);
     }
 
-    res = bee_execute_command(command, 0);
+    res = bee_execute_command(command);
     bee_flock_close(fd);
     if (res < 0) {
         BEE_EXIT(SOFTWARE);
diff --git a/src/beegetopt.c b/src/beegetopt.c
index c82acf1..8889b81 100644
--- a/src/beegetopt.c
+++ b/src/beegetopt.c
@@ -114,6 +114,7 @@ int main(int argc, char *argv[])
        switch(opt) {
            case 'V':
                 printf("beegetopt Vx.x\n");
+                // fall through
            case 'h':
                usage();
                exit(0);
diff --git a/src/beesep.c b/src/beesep.c
index e7aaa60..1e13135 100644
--- a/src/beesep.c
+++ b/src/beesep.c
@@ -70,7 +70,7 @@ static void print_escaped(char *s, size_t n)
 
     bee_fprint(stdout, "'");
 
-    while ((c = strchr(s, '\'')) && c - s < n) {
+    while ((c = strchr(s, '\'')) && c < s + n) {
         if (c-s)
             bee_fnprint(stdout, c - s, s);
         bee_fprint(stdout, "'\\''");
diff --git a/src/beesort.c b/src/beesort.c
index b8fa6b4..69fe110 100644
--- a/src/beesort.c
+++ b/src/beesort.c
@@ -61,6 +61,7 @@ int my_compare_data(void *a, void *b)
 
 void my_print(void *key, void *data)
 {
+    (void)key;
     fputs(data, stdout);
 }