diff --git a/qb/config.libs.sh b/qb/config.libs.sh
index af4d80f9b1..8089123e82 100644
--- a/qb/config.libs.sh
+++ b/qb/config.libs.sh
@@ -520,6 +520,6 @@ fi
 
 # Creates config.mk and config.h.
 add_define_make GLOBAL_CONFIG_DIR "$GLOBAL_CONFIG_DIR"
-VARS=$(eval set | grep ^HAVE_ | sed s/=.*// | sed s/^HAVE_//)
-create_config_make config.mk $VARS
-create_config_header config.h $VARS
+VARS=$(eval set | grep ^HAVE_ | sed 's/=.*//' | sed 's/^HAVE_//')
+create_config_make config.mk $(printf %s "$VARS")
+create_config_header config.h $(printf %s "$VARS")
diff --git a/qb/qb.comp.sh b/qb/qb.comp.sh
index fe97bdbedd..4636d990eb 100644
--- a/qb/qb.comp.sh
+++ b/qb/qb.comp.sh
@@ -14,7 +14,7 @@ cc_works=0
 if [ "$CC" ]; then
 	"$CC" -o "$TEMP_EXE" "$TEMP_C" >/dev/null 2>&1 && cc_works=1
 else
-	for CC in ${CC:=$(which ${CROSS_COMPILE}gcc ${CROSS_COMPILE}cc ${CROSS_COMPILE}clang 2>/dev/null)} ''; do
+	for CC in $(printf %s "${CC:=$(which ${CROSS_COMPILE}gcc ${CROSS_COMPILE}cc ${CROSS_COMPILE}clang 2>/dev/null)}") ''; do
 		"$CC" -o "$TEMP_EXE" "$TEMP_C" >/dev/null 2>&1 && cc_works=1 && break
 	done
 fi
@@ -45,7 +45,7 @@ cxx_works=0
 if [ "$CXX" ]; then
 	"$CXX" -o "$TEMP_EXE" "$TEMP_CXX" >/dev/null 2>&1 && cxx_works=1
 else
-	for CXX in ${CXX:=$(which ${CROSS_COMPILE}g++ ${CROSS_COMPILE}c++ ${CROSS_COMPILE}clang++ 2>/dev/null)} ''; do
+	for CXX in $(printf %s "${CXX:=$(which ${CROSS_COMPILE}g++ ${CROSS_COMPILE}c++ ${CROSS_COMPILE}clang++ 2>/dev/null)}") ''; do
 		"$CXX" -o "$TEMP_EXE" "$TEMP_CXX" >/dev/null 2>&1 && cxx_works=1 && break
 	done
 fi
@@ -78,9 +78,9 @@ fi
 [ -n "$PKG_CONF_PATH" ] || {
 	PKG_CONF_PATH="none"
 
-	for path in $(which "${CROSS_COMPILE}pkg-config" 2>/dev/null) ''; do
-		[ -n "$path" ] && {
-			PKG_CONF_PATH=$path;
+	for p in $(which "${CROSS_COMPILE}pkg-config" 2>/dev/null) ''; do
+		[ -n "$p" ] && {
+			PKG_CONF_PATH=$p;
 			break;
 		}
 	done
diff --git a/qb/qb.libs.sh b/qb/qb.libs.sh
index b0ce0bd1e8..0697cb0379 100644
--- a/qb/qb.libs.sh
+++ b/qb/qb.libs.sh
@@ -14,10 +14,14 @@ add_define_make()
 { echo "$1=$2" >> "$MAKEFILE_DEFINES";}
 
 add_include_dirs()
-{	while [ "$1" ]; do INCLUDE_DIRS="$INCLUDE_DIRS -I$1"; shift; done;}
+{	while [ "$1" ]; do INCLUDE_DIRS="$INCLUDE_DIRS -I$1"; shift; done
+	INCLUDE_DIRS="${INCLUDE_DIRS#* }"
+}
 
 add_library_dirs()
-{	while [ "$1" ]; do LIBRARY_DIRS="$LIBRARY_DIRS -L$1"; shift; done;}
+{	while [ "$1" ]; do LIBRARY_DIRS="$LIBRARY_DIRS -L$1"; shift; done
+	LIBRARY_DIRS="${LIBRARY_DIRS#* }"
+}
 
 check_lib()	#$1 = HAVE_$1	$2 = lib	$3 = function in lib	$4 = extralibs $5 = headers
 {	tmpval="$(eval echo \$HAVE_$1)"
@@ -36,7 +40,15 @@ check_lib()	#$1 = HAVE_$1	$2 = lib	$3 = function in lib	$4 = extralibs $5 = head
 	fi
 	answer='no'
 #	echo -n "$ECHOBUF"
-	"$CC" -o "$TEMP_EXE" "$TEMP_C" $INCLUDE_DIRS $LIBRARY_DIRS $4 $CFLAGS $LDFLAGS $2 >>config.log 2>&1 && answer='yes'
+	"$CC" -o \
+		"$TEMP_EXE" \
+		"$TEMP_C" \
+		$INCLUDE_DIRS \
+		$LIBRARY_DIRS \
+		$(printf %s "$4") \
+		$CFLAGS \
+		$LDFLAGS \
+		$(printf %s "$2") >>config.log 2>&1 && answer='yes'
 	eval HAVE_$1="$answer"; echo "$ECHOBUF ... $answer"
 	rm "$TEMP_C" "$TEMP_EXE" >/dev/null 2>&1
 	
@@ -61,7 +73,15 @@ check_lib_cxx()	#$1 = HAVE_$1	$2 = lib	$3 = function in lib	$4 = extralibs	$5 =
 	fi
 	answer='no'
 #	echo -n "$ECHOBUF"
-	"$CXX" -o "$TEMP_EXE" "$TEMP_CXX" $INCLUDE_DIRS $LIBRARY_DIRS $4 $CFLAGS $LDFLAGS $2 >>config.log 2>&1 && answer='yes'
+	"$CXX" -o \
+		"$TEMP_EXE" \
+		"$TEMP_CXX" \
+		$INCLUDE_DIRS \
+		$LIBRARY_DIRS \
+		$(printf %s "$4") \
+		$CFLAGS \
+		$LDFLAGS \
+		$(printf %s "$2") >>config.log 2>&1 && answer='yes'
 	eval HAVE_$1="$answer"; echo "$ECHOBUF ... $answer"
 	rm "$TEMP_CXX" "$TEMP_EXE" >/dev/null 2>&1
 	[ "$answer" = 'no' ] && {
@@ -262,8 +282,10 @@ create_config_make()
 			
 			case "$PKG_CONF_USED" in
 				*$1*)
-					echo "$1_CFLAGS = $(eval echo \$$1_CFLAGS)"
-					echo "$1_LIBS = $(eval echo \$$1_LIBS)"
+					FLAGS="$(eval echo \$$1_CFLAGS)"
+					LIBS="$(eval echo \$$1_LIBS)"
+					echo "$1_CFLAGS = ${FLAGS%"${FLAGS##*[! ]}"}"
+					echo "$1_LIBS = ${LIBS%"${LIBS##*[! ]}"}"
 				;;
 			esac
 			shift