diff --git a/Makefile b/Makefile
index c33f354..3a4171f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,14 @@
-DEST ?= /usr/bin
+PREFIX?=	/usr
+BINDIR=		${PREFIX}/bin
 
 all:
 	@echo Run \'make install\' to install fontpreview on your device
 
 install:
-	@cp fontpreview $(DEST)/fontpreview
-	@chmod 755 $(DEST)/fontpreview
+	@cp fontpreview $(DESTDIR)$(BINDIR)/fontpreview
+	@chmod 755 $(DESTDIR)$(BINDIR)/fontpreview
 	@echo fontpreview has been installed on your device
 
 uninstall:
-	@rm -rf $(DEST)/fontpreview
+	@rm -rf $(DESTDIR)$(BINDIR)/fontpreview
 	@echo fontpreview has been removed from your device
diff --git a/fontpreview b/fontpreview
index 039327a..608f8b8 100755
--- a/fontpreview
+++ b/fontpreview
@@ -4,12 +4,6 @@
 #
 # Dependencies: sxiv, imagemagick, xdotool, fzf
 
-# Use mktemp to create temporary files that won't
-# collide with any other application's tmp files.
-FONTPREVIEW_DIR="$(mktemp -d --tmpdir fontpreview_dir_XXXXXXXX)"
-PIDFILE="$(mktemp --tmpdir="$FONTPREVIEW_DIR" fontpreview_XXXXXXXX.pid)"
-FONT_PREVIEW="$(mktemp --tmpdir="$FONTPREVIEW_DIR" fontpreview_XXXXXXXX.png)"
-TERMWIN_IDFILE="$(mktemp --tmpdir="$FONTPREVIEW_DIR" fontpreview_XXXXXXXX.termpid)"
 VERSION=1.0.4
 
 # Default values
@@ -110,7 +104,7 @@ main(){
 
         generate_preview "$font" "$FONT_PREVIEW"
 
-        if [ $FIRST_RUN == true ]; then
+        if [[ $FIRST_RUN == true ]]; then
             FIRST_RUN=false
 
             # Display the font preview using sxiv
@@ -126,19 +120,18 @@ main(){
             # sxiv when the user exits the script
             echo $! >"$PIDFILE"
 
-	# Check for crashes of sxiv   
-	elif [ -f $PIDFILE ] ; then
-	    PID=$(cat $PIDFILE)
-	    if  [ ! -e /proc/$PID ] ; then
+	# Check for crashes of sxiv
+	elif [[ -f $PIDFILE ]] ; then
+	    if ! pgrep -F "$PIDFILE" >/dev/null 2>&1; then
 		echo "Restart sxiv - You maybe using a obsolete version. " >&2
 		# Display the font preview using sxiv
-		sxiv -g "$SIZE$POSITION" "$FONT_PREVIEW" -N "fontpreview" -b &
-		
+		sxiv -g "$SIZE$POSITION" -N "fontpreview" -b "$FONT_PREVIEW" &
+
 		# Change focus from sxiv, back to the terminal window
 		# so that user can continue to search for fonts without
 		# having to manually change focus back to the terminal window
 		xdotool windowfocus "$(cat "$TERMWIN_IDFILE")"
-		
+
 		# Save the process ID so that we can kill
 		# sxiv when the user exits the script
 		echo $! >"$PIDFILE"
@@ -155,6 +148,16 @@ trap "" SIGTSTP
 
 trap pre_exit EXIT
 
+# Use mktemp to create a temporary directory that won't
+# collide with temporary files of other application.
+FONTPREVIEW_DIR="$(mktemp -d "${TMPDIR:-/tmp}/fontpreview_dir.XXXXXXXX")" || exit
+PIDFILE="$FONTPREVIEW_DIR/fontpreview.pid"
+touch "$PIDFILE" || exit
+FONT_PREVIEW="$FONTPREVIEW_DIR/fontpreview.png"
+touch "$FONT_PREVIEW" || exit
+TERMWIN_IDFILE="$FONTPREVIEW_DIR/fontpreview.termpid"
+touch "$TERMWIN_IDFILE" || exit
+
 # Parse the arguments
 options=$(getopt -o hi:o: --long position:,size:,version,search-prompt:,font-size:,bg-color:,fg-color:,preview-text:,input:,output:,help -- "$@")
 eval set -- "$options"
@@ -162,11 +165,11 @@ eval set -- "$options"
 while true; do
     case "$1" in
         --size)
-            shift;
+            shift
             FONTPREVIEW_SIZE=$2
             ;;
         --position)
-            shift;
+            shift
             FONTPREVIEW_POSITION=$2
             ;;
         -h|--help)