move eigen to dep

.SRCINFO

@@ -1,16 +1,16 @@
 pkgbase = ignition-math
 	pkgdesc = Math classes and functions for robot applications
 	pkgver = 6.11.0
-	pkgrel = 1
+	pkgrel = 2
 	url = https://gazebosim.org/libs/math
 	arch = i686
 	arch = x86_64
 	groups = development
 	license = Apache
 	makedepends = ignition-cmake>=2
+	makedepends = eigen
 	depends = gcc-libs
 	depends = swig
-	optdepends = eigen
 	source = ignition-math-6.11.0.tar.gz::https://github.com/gazebosim/gz-math/archive/ignition-math6_6.11.0.tar.gz
 	sha256sums = e6b8901c94147e2c2659323083ce1d151495a07f9bef72a957069ce5b9f3d9e8
 

PKGBUILD

@@ -4,15 +4,14 @@
 # Contributor: Ramdambo <https://github.com/Ramdambo>
 pkgname=ignition-math
 pkgver=6.11.0
-pkgrel=1
+pkgrel=2
 pkgdesc="Math classes and functions for robot applications"
 arch=('i686' 'x86_64')
 url="https://gazebosim.org/libs/math"
 license=('Apache')
 groups=('development')
 depends=('gcc-libs' 'swig')
-makedepends=('ignition-cmake>=2')
-optdepends=('eigen')
+makedepends=('ignition-cmake>=2' 'eigen')
 conflicts=()
 source=("${pkgname}-${pkgver}.tar.gz::https://github.com/gazebosim/gz-math/archive/${pkgname}6_${pkgver}.tar.gz")
 sha256sums=("e6b8901c94147e2c2659323083ce1d151495a07f9bef72a957069ce5b9f3d9e8")