--- files/configure-gentoo.patch
+++ files/configure-gentoo.patch
@@ -10,6 +10,17 @@
  AC_PROG_CC
  AM_PROG_CC_STDC
  AC_HEADER_STDC
+@@ -21,6 +19,10 @@
+ 
+ 
+ dnl Checks for libraries.
++dnl Check for libm for fmod()
++AC_SEARCH_LIBS([fmod], [m], [], [
++	AC_MSG_ERROR([unable to find the fmod() function])
++])
+ 
+ 
+ dnl Checks for header files.
 diff -Naur euler-1.61.0/src/Makefile.am euler-1.61.0-new/src/Makefile.am
 --- euler-1.61.0/src/Makefile.am	2005-10-30 22:48:35.000000000 +0000
 +++ euler-1.61.0-new/src/Makefile.am	2006-02-08 23:41:32.000000000 +0000

--- euler-1.61.0.ebuild
+++ euler-1.61.0.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/sci-mathematics/euler/euler-1.61.0.ebuild,v 1.10 2012/05/04 07:46:51 jdhore Exp $
 
-EAPI="1"
+EAPI=5
 
 inherit autotools eutils
 
@@ -20,10 +20,7 @@
 RDEPEND="x11-libs/gtk+:2
 	x11-misc/xdg-utils"
 
-src_unpack() {
-	unpack ${A}
-	cd "${S}"
-
+src_prepare() {
 	epatch "${FILESDIR}"/configure-gentoo.patch
 	epatch "${FILESDIR}"/command-gcc4-gentoo.patch
 	epatch "${FILESDIR}"/${PN}-glibc-2.4-gentoo.patch
@@ -39,7 +36,3 @@
 		|| die "sed for docs failed"
 	eautoreconf
 }
-
-src_install() {
-	emake DESTDIR="${D}" install || die "emake install failed"
-}