diff --git a/utils/lib/Makefile b/utils/lib/Makefile
index dac6a7375..cf78e808a 100644
--- a/utils/lib/Makefile
+++ b/utils/lib/Makefile
@@ -6,8 +6,13 @@
 F90 = gfortran
 CC = gcc
 
-#############################################################
+# modify to point to your own SAC installation path
+SAC_DIR = /opt/sac
+SAC_INC = ${SAC_DIR}/include
+SAC_LIB = ${SAC_DIR}/lib
+
 
+#############################################################
 
 F90FLAGS = -O2
 CCFLAGS = -O2
@@ -20,11 +25,25 @@ COBJ = $(patsubst %,%.o,$(CSRC))
 OBJ = $(F90OBJ) $(COBJ)
 
 
-all :  lib
+all :  lib convolve_stf
 
 lib : $(OBJ)
 
 
+#
+# convolve_stf
+#
+CFLAGS = -I$(SAC_INC)
+LIBS = -L$(SAC_LIB) -lsac -lsacio
+
+convolve_stf: convolve_stf.c
+	$(CC) $(CFLAGS) -o convolve_stf convolve_stf.c $(LIBS)
+
+
+
+#
+# library routines
+#
 $(F90OBJ) : %.o : %.f90
 	$(F90)  $(F90FLAGS) -c $*.f90
 
@@ -32,7 +51,7 @@ $(COBJ): %.o : %.c
 	$(CC) $(CCFLAGS) -c $*.c
 
 clean:
-	\rm -f $(OBJS) *~ *.o
+	\rm -f $(OBJS) *~ *.o convolve_stf
 
 cleanall:
-	\rm -f $(OBJS)  *.o *~
+	\rm -f $(OBJS)  *.o *~ convolve_stf
diff --git a/utils/lib/convolve_stf.c b/utils/lib/convolve_stf.c
index cbd4fcd30..89aad5546 100644
--- a/utils/lib/convolve_stf.c
+++ b/utils/lib/convolve_stf.c
@@ -25,7 +25,12 @@
 #include <errno.h>
 #include <math.h>
 #include "sacio.h"
-#include "config.h"
+
+//from: #include "config.h"
+// 64-bit
+// typedef long int sac_int_t;
+// 32-bit
+typedef int sac_int_t;
 
 
 /* defined in libsac */
diff --git a/utils/seis_process/process_syn.pl b/utils/seis_process/process_syn.pl
index 358dfdfa7..6169634bf 100755
--- a/utils/seis_process/process_syn.pl
+++ b/utils/seis_process/process_syn.pl
@@ -73,10 +73,12 @@ END
 $phtimes="./phtimes.csh";
 $asc2sac="ascii2sac.csh";
 
-#if (! -e $saclst)  {die(" No $saclst file\n");}
+#if (! -e $saclst)  {die("No $saclst file\n");}
 #if (! -e $phtimes) {die("No $phtimes file\n");}
 #if (! -e $asc2sac) {die("No $asc2sac file\n");}
 
+
+
 $min_hdur=1.0;
 
 if ($opt_m) { # extract event information from CMTSOLUTION