diff --git a/Makefile b/Makefile
index 1b323dfe1d..df5246b3bc 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ ifdef WIN32
 	$(CC) -std=gnu11 -DUNICODE -D_UNICODE -w -o v0.exe vc/v_win.c
 	./v0.exe -o v.exe compiler
 else
-	$(CC) -std=gnu11 -w -o v vc/v.c -lm
+	$(CC) -std=gnu11 -o v vc/v.c -lm
 endif
 	rm -rf vc/
 	@echo "V has been successfully built"
diff --git a/compiler/parser.v b/compiler/parser.v
index 389140a751..57a32412c9 100644
--- a/compiler/parser.v
+++ b/compiler/parser.v
@@ -2052,7 +2052,6 @@ fn (p mut Parser) expression() string {
 		println('expression() pass=$p.pass tok=')
 		p.print_tok()
 	}
-	p.cgen('/* expr start*/')
 	ph := p.cgen.add_placeholder()
 	mut typ := p.term()
 	is_str := typ=='string'
@@ -2123,10 +2122,14 @@ fn (p mut Parser) expression() string {
 			typ = p.dot(typ, ph)
 		}
 	}
-	// + - |
-	for p.tok == .plus || p.tok == .minus || p.tok == .pipe || p.tok == .amp || p.tok == .xor {
+	// + - | ^
+	for p.tok == .plus || p.tok == .minus || p.tok == .pipe || p.tok == .amp ||
+		 p.tok == .xor {
 		// for p.tok in [.plus, .minus, .pipe, .amp, .xor] {
 		tok_op := p.tok
+		if typ == 'bool' {
+			p.error('operator ${p.tok.str()} not defined on bool ')
+		}	
 		is_num := typ == 'void*' || typ == 'byte*' || is_number_type(typ)
 		p.check_space(p.tok)
 		if is_str && tok_op == .plus && !p.is_js {
diff --git a/september.plan b/september.plan
index e7bc583e50..efaab00de6 100644
--- a/september.plan
+++ b/september.plan
@@ -16,7 +16,7 @@
 - v ui for linux
 - doom.v
 + tcc backend
-- fix all c warnings with -pedantic
++ fix all c warnings with -pedantic
 + set up pvs
 - ui/orm demo: a simple gui client for postgres/mysql/sqlite
 - ui demo: calculator
diff --git a/vlib/os/os.v b/vlib/os/os.v
index c16a8c46b8..547495115a 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -457,12 +457,12 @@ pub fn filename(path string) string {
 // get_line returns a one-line string from stdin
 pub fn get_line() string {
     str := get_raw_line()
-		$if windows {
-			return str.trim_right('\r\n')
-		}
-		$else {
-			return str.trim_right('\n')
-		}
+	$if windows {
+		return str.trim_right('\r\n')
+	}
+	$else {
+		return str.trim_right('\n')
+	}
 }
 
 // get_raw_line returns a one-line string from stdin along with '\n' if there is any
@@ -476,16 +476,13 @@ pub fn get_raw_line() string {
         return ''
     }
 	$else {
-		//u64 is used because C.getline needs a size_t as second argument
-		//Otherwise, it would cause a valgrind warning and may be dangerous
-		//Malloc takes an int as argument so a cast has to be made
-		max := u64(256)
-		buf := malloc(int(max))
+		max := size_t(256)
+		buf := *char(malloc(int(max)))
 		nr_chars := C.getline(&buf, &max, stdin)
 		if nr_chars == 0 {
 			return ''
 		}
-		return string(buf, nr_chars)
+		return string(byteptr(buf), nr_chars)
 	}
 }
 
@@ -591,6 +588,9 @@ fn on_segfault(f voidptr) {
 	}
 }
 
+fn C.getpid() int
+fn C.proc_pidpath (int, byteptr, int) int
+
 pub fn executable() string {
 	$if linux {
 		mut result := malloc(MAX_PATH)
@@ -738,6 +738,10 @@ pub fn signal(signum int, handler voidptr) {
 	C.signal(signum, handler)
 }
 
+
+fn C.fork() int
+fn C.wait() int
+
 pub fn fork() int {
 	$if !windows {
 		pid := C.fork()
diff --git a/vlib/os/os_nix.v b/vlib/os/os_nix.v
index f06c9b7733..67d4ddda87 100644
--- a/vlib/os/os_nix.v
+++ b/vlib/os/os_nix.v
@@ -39,7 +39,7 @@ pub fn ls(path string) []string {
 		if isnil(ent) {
 			break
 		}
-		name := tos_clone(ent.d_name)
+		name := tos_clone(byteptr(ent.d_name))
 		if name != '.' && name != '..' && name != '' {
 			res << name
 		}
diff --git a/vlib/time/time.v b/vlib/time/time.v
index c216da13a1..9228cfc538 100644
--- a/vlib/time/time.v
+++ b/vlib/time/time.v
@@ -38,6 +38,8 @@ struct C.tm {
 	tm_sec  int
 }
 
+fn C.time(int) i64
+
 pub fn now() Time {
 	t := C.time(0)
 	mut now := &C.tm{!}