diff --git a/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1-GCC-12.2.0.eb b/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1-GCC-12.2.0.eb
index 9a77c6b3a775..80c8cc122032 100644
--- a/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1-GCC-12.2.0.eb
+++ b/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1-GCC-12.2.0.eb
@@ -37,7 +37,12 @@ components = [
     (name, version, {
         'source_urls': ['https://github.com/mpimd-csc/flexiblas/releases/download/v%(version)s/'],
         'sources': [SOURCELOWER_TAR_GZ],
-        'checksums': ['5be7e508e2dbb751b3bf372639d8e82a11f79e9ef6cbf243b64981c24a5703cf'],
+        'patches': ['FlexiBLAS-3.2.1_fix-zgbtrf-vectorizer-compilation.patch'],
+        'checksums': [
+            '5be7e508e2dbb751b3bf372639d8e82a11f79e9ef6cbf243b64981c24a5703cf',  # flexiblas-3.2.1.tar.gz
+            '8814a134331fb7734c47bb5b9bb9f16d4294a379b41ab084640dcdabbf09c79c',
+            # FlexiBLAS-3.2.1_fix-zgbtrf-vectorizer-compilation.patch
+        ],
         'backends': local_backends,
     }),
     ('LAPACK', '3.10.1', {
diff --git a/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1_fix-zgbtrf-vectorizer-compilation.patch b/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1_fix-zgbtrf-vectorizer-compilation.patch
new file mode 100644
index 000000000000..4ea929473c2e
--- /dev/null
+++ b/easybuild/easyconfigs/f/FlexiBLAS/FlexiBLAS-3.2.1_fix-zgbtrf-vectorizer-compilation.patch
@@ -0,0 +1,25 @@
+# make some work matrices allocatable to bypass errors generated by -ftree-vectorize with gcc 12.x on zen4/zen5
+# author: Bart Oldeman (Digital Research Alliance of Canada)
+diff -ur flexiblas-3.2.1.orig/contributed/lapack-3.10.1/SRC/zgbtrf.f flexiblas-3.2.1/contributed/lapack-3.10.1/SRC/zgbtrf.f
+--- flexiblas-3.2.1.orig/contributed/lapack-3.10.1/SRC/zgbtrf.f	2023-04-03 14:07:31.000000000 +0000
++++ flexiblas-3.2.1/contributed/lapack-3.10.1/SRC/zgbtrf.f	2025-09-24 15:29:42.138091646 +0000
+@@ -169,8 +169,8 @@
+       COMPLEX*16         TEMP
+ *     ..
+ *     .. Local Arrays ..
+-      COMPLEX*16         WORK13( LDWORK, NBMAX ),
+-     $                   WORK31( LDWORK, NBMAX )
++      COMPLEX*16, ALLOCATABLE :: WORK13( :, : ),
++     $                   WORK31( :, : )
+ *     ..
+ *     .. External Functions ..
+       INTEGER            ILAENV, IZAMAX
+@@ -232,6 +232,8 @@
+ *
+ *        Use blocked code
+ *
++         ALLOCATE(WORK13(LDWORK, NBMAX), WORK31(LDWORK, NBMAX))
++*
+ *        Zero the superdiagonal elements of the work array WORK13
+ *
+          DO 20 J = 1, NB