diff --git a/arpack-install-arpackicb_h.patch b/arpack-install-arpackicb_h.patch
new file mode 100644
index 0000000..ef2757b
--- /dev/null
+++ b/arpack-install-arpackicb_h.patch
@@ -0,0 +1,12 @@
+diff -up src/Makefile.am.icb src/Makefile.am
+--- src/Makefile.am.icb	2020-12-07 11:40:45.000000000 +0100
++++ src/Makefile.am	2021-09-02 23:55:29.346733967 +0200
+@@ -1,7 +1,7 @@
+ ACLOCAL_AMFLAGS = -I m4
+ 
+ pkgincludedir = $(includedir)/arpack
+-pkginclude_HEADERS = debug.h stat.h arpackdef.h
++pkginclude_HEADERS = debug.h stat.h arpackdef.h arpackicb.h
+ 
+ AM_DISTCHECK_CONFIGURE_FLAGS =
+ if MPI
diff --git a/arpack.spec b/arpack.spec
index e9566d6..8200b85 100644
--- a/arpack.spec
+++ b/arpack.spec
@@ -1,45 +1,27 @@
 %global build64 0
-%if 0%{?fedora} >= 26 || 0%{?rhel} >= 7
-%{!?openblas_arches:%global openblas_arches x86_64 %{ix86} armv7hl %{power64} aarch64}
-%ifnarch %{openblas_arches}
-# matches openblas ExclusiveArch
-%bcond_without atlas
-%else
 %if 0%{?__isa_bits} == 64
 %global build64 1
 %endif
-%endif
-%endif
-
-%if 0%{?fedora} >= 33
-%bcond_without flexiblas
-%endif
 
 # We are linking FORTRAN symbols.  Thus we cannot link --as-needed.
 %undefine _ld_as_needed
 
 Name:		arpack
 Version:	3.8.0
-Release:	2%{dist}
+Release:	3%{dist}
 Summary:	Fortran 77 subroutines for solving large scale eigenvalue problems
 
 License:	BSD
 URL:		https://github.com/opencollab/arpack-ng
 Source0:	https://github.com/opencollab/arpack-ng/archive/%{version}/arpack-ng-%{version}.tar.gz
+# https://bugzilla.redhat.com/show_bug.cgi?id=1990366
+Patch0:         arpack-install-arpackicb_h.patch
 
 BuildRequires:	gcc-c++
 BuildRequires:	gcc-gfortran
-%if %{with flexiblas}
-BuildRequires:  pkgconfig(flexiblas)
-%else
-%if %{with atlas}
-BuildRequires:	atlas-devel
-%else
-BuildRequires:	openblas-devel
-%endif
-%endif
+BuildRequires:	pkgconfig(flexiblas)
 BuildRequires:	libtool >= 2.4.2
-BuildRequires: make
+BuildRequires:	make
 Provides:	arpack-ng = %{version}-%{release}
 Provides:	arpack-ng%{?_isa} = %{version}-%{release}
 
@@ -92,6 +74,7 @@ library and so links used for building arpack based applications.
 %setup -qc
 mv arpack-ng-%{version} src
 pushd src
+%patch0 -p1
 autoreconf -vif
 popd
 %if %{build64}
@@ -100,23 +83,10 @@ cp -pr src src64
 
 
 %build
-%if %{with flexiblas}
-%global blaslib -lflexiblas
-%else
-%if %{with atlas}
-%if 0%{?fedora} || 0%{?rhel} >= 7
-%global blaslib -L%{_libdir}/atlas -ltatlas
-%else
-%global blaslib -L%{_libdir}/atlas -lf77blas -latlas
-%endif
-%else
-%global blaslib -lopenblasp
-%endif
-%endif
 pushd src
 %configure --enable-shared --enable-static \
-    --with-blas="%{blaslib}" \
-    --with-lapack="%{blaslib}" \
+    --with-blas=-lflexiblas \
+    --with-lapack=-lflexiblas \
     --enable-icb
 %make_build
 popd
@@ -125,8 +95,8 @@ pushd src64
 %configure --enable-shared --enable-static \
     LIBSUFFIX=64 \
     INTERFACE64=1 \
-    --with-blas=%{blaslib}64 \
-    --with-lapack=%{blaslib}64 \
+    --with-blas=-lflexiblas64 \
+    --with-lapack=-lflexiblas64 \
     --enable-icb
 %make_build
 popd
@@ -143,7 +113,6 @@ popd
 %endif
 # Get rid of .la files
 rm -r %{buildroot}%{_libdir}/*.la
-# Get rid of generic file names (https://github.com/opencollab/arpack-ng/issues/130)
 
 %check
 pushd src
@@ -157,8 +126,6 @@ pushd EXAMPLES ; make clean ; popd
 popd
 %endif
 
-%ldconfig_scriptlets
-
 %files
 %doc src/CHANGES src/README.md
 %license src/COPYING
@@ -192,6 +159,11 @@ popd
 
 
 %changelog
+* Thu Sep 02 2021 Dominik Mierzejewski <rpm@greysector.net> - 3.8.0-3
+- ensure arpackicb.h is installed (#1990366)
+- spec clean-up: drop support for building with other blas libs on F34+
+- drop obsolete ldconfig scriptlet macro
+
 * Wed Jul 21 2021 Fedora Release Engineering <releng@fedoraproject.org> - 3.8.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild