libechonest: make qt4 and qt5 version coinstallable.

libechonest/PKGBUILD

@@ -1,20 +1,17 @@
 pkgname=libechonest
 pkgver=2.3.1
-pkgrel=5
+pkgrel=6
 pkgdesc="C++ library for interfacing with Echo Nest"
 arch=('x86_64')
 url="https://projects.kde.org/projects/playground/libs/libechonest"
 license=('GPL')
 depends=('qt5-base')
 makedepends=('cmake')
-conflicts=('libechonest-qt4')
 source=(http://files.lfranchi.com/${pkgname}-${pkgver}.tar.bz2)
 sha1sums=('9d7245c71e707651a7054ce6f0d90b9a62004b23')
 
 prepare() {
-  rm -rf "build"
-  mkdir "build"
-  
+  rm -rf "build" && mkdir -p "build"
 }
 
 build() {