--- OpenBLAS-0.2.20/c_check	2018/01/19 15:53:41	1.1
+++ OpenBLAS-0.2.20/c_check	2018/01/19 15:54:23
@@ -10,7 +10,7 @@
 $hostarch = "arm" if ($hostarch =~ /^arm.*/);
 $hostarch = "arm64" if ($hostarch eq "aarch64");
 $hostarch = "power" if ($hostarch =~ /^(powerpc|ppc).*/);
-$hostarch = "zarch" if ($hostarch eq "s390x");
+$hostarch = "zarch" if ($hostarch =~ /^s390/);
 
 $tmpf = new File::Temp( UNLINK => 1 );
 $binary = $ENV{"BINARY"};
--- OpenBLAS-0.2.20/ctest.c	2018/01/19 15:54:29	1.1
+++ OpenBLAS-0.2.20/ctest.c	2018/01/19 15:54:49
@@ -105,7 +105,7 @@
 ARCH_POWER
 #endif
 
-#if defined(__s390x__) || defined(__zarch__)
+#if defined(__s390x__) || defined(__s390__) || defined(__zarch__)
 ARCH_ZARCH
 #endif
 
--- OpenBLAS-0.2.20/getarch.c	2018/01/19 15:54:57	1.1
+++ OpenBLAS-0.2.20/getarch.c	2018/01/19 15:55:07
@@ -974,7 +974,7 @@
 #define OPENBLAS_SUPPORTED
 #endif
 
-#if defined(__zarch__) || defined(__s390x__)
+#if defined(__zarch__) || defined(__s390x__) || defined(__s390__)
 #define ZARCH
 #include "cpuid_zarch.c"
 #define OPENBLAS_SUPPORTED