diff --git a/bin/caam b/bin/caam
index 73875ec..5dceb93 100755
--- a/bin/caam
+++ b/bin/caam
@@ -33,7 +33,6 @@
   */caam*) top=`dirname $dir` ;;
   *)     top="$dir" ;;
 esac
-echo d=$dir, top=$top
 
 chasemytop () (
  me=$0; cd $mydir
@@ -55,11 +54,63 @@
 [ "$CAAM_DEBUG" ] && echo wrapdir=$WRAPDIR
 SUSPEND=:
 CAAM_LOG=true
+logsuffix=${CAAM_LOGSUFFIX:-$myname}
+if [ -w .. ]; then
+  logfile=../`basename $PWD`.$logsuffix
+else
+  logdir=/tmp/caamLogBy-`logname`	# No need to care race condition
+  [ -d $logdir ] || mkdir $logdir
+  logfile=$logdir/`basename $PWD`.$logsuffix
+fi
 
+usage() {
+  cat<<-EOF
+	$myname: Configure And And Make helper
+	Usage: $myname [caam-options] [configure-options]
+	Available caam-options:
+	  -m		Do make only, not calling configure
+	  -c		Do configure only, not calling make
+	  -g		Call "gmake" instead of default "make"
+	  -mai, -gmai	"make all install", "gmake all install"
+	  -maic, -gmaic	"make all install clean", ditto for gmake
+	  -t TGT	Set TGT as "make" target instead of "all"
+	  -k MKOPT	Call make with option MKOPT
+	  -jN, -j N	Make job concurrency set to N
+	  -s SEC	Sleep SEC seconds between configure and make
+	  -S 		Suspend execution of $myname before calling make
+	  -h HOOK	Call HOOK script between configure and make
+	  -l		Replace ./libtool to that of the system
+	  -o LOG	Output log to LOG (default: $logfile)
+	  -d		Debug information
+
+	Available environment variables:
+	  CAAM_PREFIXES		Reset default prefix
+	  CAAM_ADD		Colon delimited additional prefixes
+	  CAAM_LOGSUFFIX	Logfile's suffix w/o dot (default: $myname)
+	  CC, CFLAGS, CXX, LDFLAGS, CPPFLAGS and ac_cv_* for many compiler
+	 	systems are also passed to them
+	Examples:
+	  $myname -j5
+	    --> ./configure && make -j5
+
+	  $myname -gmai --prefix=/usr/local/foo
+	    --> ./configure --prefix=/usr/local/foo && gmake all install
+
+	  CAAM_ADD=gtk2:/usr/X11R7 $myname -maic --prefix=/usr/local/bar
+	    --> Add -I$top/gtk2/include and -I/usr/X11R7/include
+	 	to CFLAGS, add
+	 	  -L$top/gtk2/lib -R$top/gtk2/lib
+	 	  -L/usr/X11R7/lib -R/usr/X11R7/lib
+	 	to LDFLAGS, then call
+	 	./configure --preifx=/usr/local/bar && make all install clean
+	EOF
+  exit 0
+}
 # Parse my own arguments
 while [ x"" != x"$1" ]; do
   case "$1" in
     --)		break;;
+    -help|--help)	usage ;;
     -gmaic)	TGT2="install clean"; CAAM_MAKE=gmake;;
     -maic)	TGT2="install clean";;
     -gmai)	TGT2="install"; CAAM_MAKE=gmake;;
@@ -100,7 +151,7 @@
 # extract pkg-config path's
 pcp=$PKG_CONFIG_PATH
 
-[ $debug ] && echo ca=$ca
+[ $debug ] && { echo d=$dir, top=$top, ca=$ca; }
 for e in $ca '' $dpx; do
   case "$e" in
     /*) pfx=$e ;;
@@ -192,10 +243,10 @@
 
 successlog() (
  status=$?
- if $CAAM_LOG; then
+ $CAAM_LOG || return
+ if touch $logfile 2>/dev/null; then
    PWD=`pwd`				# for compatibility
    uname=`uname -sm 2>/dev/null`
-   logfile=../`basename $PWD`.caam
    [ -s $logfile ] || echo "### $logfile started at `date`" > $logfile
    (echo 1i
     echo "# ** $uname ** - $myname succeeded at `date`"
@@ -222,6 +273,8 @@
    echo "Saved caam log in $logfile."
    echo "To build again with same parameters:    sh $logfile"
    echo "To see successfull caam arguments:      sh $logfile -n"
+ else
+   echo "Cannot output log to [$logfile]" >&2
  fi
  exit $status
 )