From 0ad268f991f6f3191e9fdeeb65d9731b7c542a80 Mon Sep 17 00:00:00 2001
From: ddelange <14880945+ddelange@users.noreply.github.com>
Date: Tue, 18 Apr 2023 10:57:53 +0200
Subject: [PATCH 1/3] Add support for OpenBLAS

---
 m4/ax_cblas.m4 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/m4/ax_cblas.m4 b/m4/ax_cblas.m4
index 0c87c29f..4acda990 100644
--- a/m4/ax_cblas.m4
+++ b/m4/ax_cblas.m4
@@ -157,6 +157,11 @@ if test $ax_cblas_ok = no; then
     AC_CHECK_LIB(cblas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lcblas"])
 fi
 
+# Generic BLAS library? (for instance OpenBLAS)
+if test $ax_cblas_ok = no; then
+    AC_CHECK_LIB(cblas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lblas"])
+fi
+
 AC_SUBST(CBLAS_LIBS)
 
 LIBS="$ax_cblas_save_LIBS"

From 8eb721f6a1bfc358e2ad7763921756af866ebb91 Mon Sep 17 00:00:00 2001
From: ddelange <14880945+ddelange@users.noreply.github.com>
Date: Tue, 18 Apr 2023 11:19:31 +0200
Subject: [PATCH 2/3] Fix typo

---
 m4/ax_cblas.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/m4/ax_cblas.m4 b/m4/ax_cblas.m4
index 4acda990..0e0d68d3 100644
--- a/m4/ax_cblas.m4
+++ b/m4/ax_cblas.m4
@@ -159,7 +159,7 @@ fi
 
 # Generic BLAS library? (for instance OpenBLAS)
 if test $ax_cblas_ok = no; then
-    AC_CHECK_LIB(cblas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lblas"])
+    AC_CHECK_LIB(blas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lblas"])
 fi
 
 AC_SUBST(CBLAS_LIBS)

From 6f9567742711dbd929ab6df7eb2caf01ab6325e0 Mon Sep 17 00:00:00 2001
From: ddelange <14880945+ddelange@users.noreply.github.com>
Date: Tue, 18 Apr 2023 12:00:10 +0200
Subject: [PATCH 3/3] Explicit -lopenblas

---
 m4/ax_cblas.m4 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/m4/ax_cblas.m4 b/m4/ax_cblas.m4
index 0e0d68d3..da89cab9 100644
--- a/m4/ax_cblas.m4
+++ b/m4/ax_cblas.m4
@@ -152,12 +152,17 @@ if test $ax_cblas_ok = no; then
             [], [-lblas])])
 fi
 
+# BLAS in OpenBLAS library?
+if test $ax_cblas_ok = no; then
+    AC_CHECK_LIB(openblas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lopenblas"])
+fi
+
 # Generic CBLAS library?
 if test $ax_cblas_ok = no; then
     AC_CHECK_LIB(cblas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lcblas"])
 fi
 
-# Generic BLAS library? (for instance OpenBLAS)
+# Generic BLAS library?
 if test $ax_cblas_ok = no; then
     AC_CHECK_LIB(blas, cblas_dgemm, [ax_cblas_ok=yes; CBLAS_LIBS="-lblas"])
 fi