diff -urN gcin-1.4.6.orig/configure gcin-1.4.6/configure
--- gcin-1.4.6.orig/configure	2010-01-05 13:59:59.421672901 +0800
+++ gcin-1.4.6/configure	2010-01-05 13:59:18.108769539 +0800
@@ -215,9 +215,6 @@
 
 
 OPTFLAGS="-g"
-if [ $prefix = /usr ]; then
-  OPTFLAGS="-O"
-fi
 
 if [ -z $CC ]; then
   CC=gcc
@@ -239,7 +239,7 @@
 echo "libdir=\$(DESTDIR)$libdir" >> config.mak
 echo "gcinlibdir=\$(libdir)/gcin" >> config.mak
 echo "includedir=\$(DESTDIR)$includedir" >> config.mak
-echo "LDFLAGS=$GTKLDFLAGS -lX11" >> config.mak
+echo "LDFLAGS=$GTKLDFLAGS -lX11 -lm" >> config.mak
 echo "GCIN_VERSION=$GCIN_VERSION" >> config.mak
 echo "GCIN_TABLE_DIR=\$(datadir_r)/gcin/table" >> config.mak
 echo "GCIN_OGG_DIR=\$(datadir_r)/gcin/ogg" >> config.mak