diff -Nur ccrypt-1.7.orig/configure.in ccrypt-1.7.kill-O3/configure.in
--- ccrypt-1.7.orig/configure.in	2004-03-29 06:52:12.000000000 +0200
+++ ccrypt-1.7.kill-O3/configure.in	2006-08-05 14:41:22.000000000 +0200
@@ -46,16 +46,11 @@
 dnl Check for programs.
 AC_PROG_CC
 
-dnl  Note: CFLAGS can now be specified by the user at ./configure time,
-dnl  but we enforce -O3, as this really makes a big difference in terms
-dnl  of performance for ccrypt. (74% faster than -O0, 19% faster than
-dnl  -O2). The space/time tradeoff is biased in favor of time for ccrypt.
-
 if test "$GCC" = "yes"; then
    if test "$iCFLAGS" = ""; then
-     CFLAGS="-O3 -Wall"
+     CFLAGS="-Wall"
    else
-     CFLAGS="$iCFLAGS -O3"
+     CFLAGS="$iCFLAGS"
    fi
 fi