proguard-project.txt is renamed ot proguard-rules.pro

app/build.gradle

@@ -36,13 +36,18 @@ preBuild.dependsOn createVersionXML
 //	Convert SVG images from art directory into PNG files.
 //
 task generateDrawablesFromArt {
+
 	doLast {
+        def indir = "app/src/main/art"
+        def outdir = "../res"
+
         String backslash= System.getProperty("file.separator")
         def buildDir = (new File(project.buildDir,'art')).toString()
         buildDir = buildDir.replace(backslash,"/")
-        println 'make -C app/src/main/art RES=../res TMP='+buildDir
-        def p = ('make -C app/src/main/art RES=../res TMP='+buildDir).execute()
-		p.consumeProcessOutput()
+        def cmd = "make -C ${indir} RES=${outdir} TMP=${buildDir}"
+        println cmd
+        def p = cmd.execute()
+		p.consumeProcessOutput(System.err,System.err)
 		p.waitFor()
 		if ( p.exitValue() )
 			throw new GradleException("Generation of art failed.")
@@ -63,7 +68,7 @@ android {
     buildTypes {
         release {
             runProguard true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             signingConfig signingConfigs.sokoban_release
         }