--- a/Makefile.in
+++ b/Makefile.in
@@ -65,14 +65,14 @@
 install: install-$(TARGET) install-@LIBTARGET@
 
 install-$(TARGET): $(TARGET)
-	$(INSTALL) -d -m 755 $(bindir)
-	$(INSTALL) -s -m 755 $(TARGET) $(bindir)/$(TARGET)
-	$(INSTALL) -d -m 755 $(mandir)/man1
-	$(INSTALL) -m 644 ifstat.1 $(mandir)/man1/ifstat.1
+	$(INSTALL) -d -m 755 $(DESTDIR)/$(bindir)
+	$(INSTALL) -m 755 $(TARGET) $(DESTDIR)/$(bindir)/$(TARGET)
+	$(INSTALL) -d -m 755 $(DESTDIR)/$(mandir)/man1
+	$(INSTALL) -m 644 ifstat.1 $(DESTDIR)/$(mandir)/man1/ifstat.1
 
 install-$(LIBTARGET): $(LIBTARGET) libifstat-config
-	$(INSTALL) -d -m 755 $(bindir)
-	$(INSTALL) -m 755 libifstat-config $(bindir)/libifstat-config
+	$(INSTALL) -d -m 755 $(DESTDIR)/$(bindir)
+	$(INSTALL) -m 755 libifstat-config $(DESTDIR)/$(bindir)/libifstat-config
 	$(INSTALL) -d -m 755 $(includedir)
 	$(INSTALL) -m 644 ifstat.h $(includedir)/ifstat.h
 	$(INSTALL) -d -m 755 $(libdir)
--- a/configure.in
+++ b/configure.in
@@ -55,9 +55,8 @@
 # checking for proc (Linux)
 if test "x$with_proc" != "xno"; then
   case "$with_proc" in
-     /*) file=$with_proc ;;
-     *) file=/proc/net/dev ;;
-  esac
+     /*) file=$with_proc; with_proc=yes ;;
+     *) file=/proc/net/dev
   AC_MSG_CHECKING([for proc interface in $file])
   if grep -q Inter- $file 2>/dev/null; then
     AC_DEFINE([USE_PROC], 1, [Define if you want to use /proc to get stats])
@@ -69,6 +68,8 @@
     with_proc=no
   fi
   AC_MSG_RESULT([$with_proc])
+        ;;
+  esac
 fi
 
 # checking for kstat (Solaris)
@@ -393,7 +394,7 @@
                 [snmp_ok=yes], [snmp_ok=no])
     AC_MSG_RESULT([$snmp_ok])
     if test "x$snmp_ok" = "xyes"; then
-      with_snmp=yes
+      use_snmp=yes
       snmp_type=net
     else
       CPPFLAGS="$OCPPFLAGS"
@@ -402,22 +403,22 @@
   fi
 
   if test "x$snmp_ok" != "xyes"; then
-    if test "x$with_snmp" != "xyes" ; then
+    if test "x$use_snmp" != "xyes" ; then
       CPPFLAGS="$CPPFLAGS -I$with_snmp/include"
       LDFLAGS="$LDFLAGS -L$with_snmp/lib"
     fi
     AC_CHECK_HEADER(net-snmp/net-snmp-config.h, snmp_type=net,
 	  	    [AC_CHECK_HEADER(ucd-snmp/ucd-snmp-config.h,
-                                     snmp_type=ucd, with_snmp=no)])
+                                     snmp_type=ucd, use_snmp=no)])
 
-    if test "x$with_snmp" != "xno"; then
+    if test "x$use_snmp" != "xno"; then
       if test "x$snmp_type" = "xnet"; then
          libsnmp="-lnetsnmp"
       else
          libsnmp="-lsnmp"
       fi
 
-      with_snmp=no
+      use_snmp=no
       SNMPLIBALONE="$libsnmp"
       # Setting to be able to force linking with -lcrypto....
       # This is needed on OpenBSD (at least) where the snmplib port links without -lcrypto,
@@ -429,18 +430,18 @@
         SNMPLIBALONE=""
       fi
       for lib in $SNMPLIBALONE "$libsnmp -lcrypto" ; do
-        if test "x$with_snmp" != "xyes" ; then
+        if test "x$use_snmp" != "xyes" ; then
           AC_MSG_CHECKING([for snmp support in $lib])
           OLIBS="$LIBS"
           LIBS="$LIBS $lib"
           AC_TRY_LINK([], [snmp_sess_init();],
-                      [with_snmp=yes], [LIBS="$OLIBS"])
-          AC_MSG_RESULT([$with_snmp])
+                      [use_snmp=yes], [LIBS="$OLIBS"])
+          AC_MSG_RESULT([$use_snmp])
         fi
       done
     fi
   fi
-  if test "x$with_snmp" = "xyes" ; then
+  if test "x$use_snmp" = "xyes" ; then
     AC_DEFINE([USE_SNMP], 1, [Define if you have SNMP support])
     if test "x$snmp_type" = "xnet"; then
        AC_DEFINE([HAVE_NET_SNMP], 1,
@@ -464,10 +465,13 @@
 
 # checking that we do have at least one driver
 if test "x$local" != "xyes"; then
+  AC_MSG_WARN([no native stats gathering mechanism found; will use SNMP.])
   if test "x$with_snmp" = "xyes"; then
-    AC_MSG_WARN([no native stats gathering mechanism found; will use SNMP.])
-  else
-    AC_MSG_ERROR([no statistics gathering methods found, porting needed.])
+    if test "x$use_snmp" = "xno"; then
+      AC_MSG_ERROR([net-snmp requested but not found.])
+    else
+      AC_MSG_ERROR([no statistics gathering methods found, porting needed.])
+    fi
   fi
 fi