diff --git a/avr-libc.spec b/avr-libc.spec
index 57fb355..921d121 100644
--- a/avr-libc.spec
+++ b/avr-libc.spec
@@ -7,7 +7,7 @@
 
 Name:           avr-libc
 Version:        2.0.0
-Release:        13%{?dist}
+Release:        14%{?dist}
 Summary:        C library for use with GCC on Atmel AVR microcontrollers
 License:        BSD
 URL:            http://www.nongnu.org/avr-libc/
@@ -85,6 +85,10 @@ sed -i 's|@DOC_INST_DIR@/man|%{_prefix}/avr/share/man|' scripts/avr-man.in
 
 %build
 ./bootstrap
+
+# really don't try to force distrowide flags on crosscompiled noarch
+unset CC CXX CFLAGS CXXFLAGS FFLAGS FCFLAGS LDFLAGS LT_SYS_LIBRARY_PATH
+
 # The ps doc ways in at 7Mb versus 2.5 for the pdf and has little added value
 ./configure --prefix=%{_prefix} --host=avr --build=`./config.guess` #--enable-doc
 # don't use %{?_smp_mflags}, it breaks the build
@@ -138,6 +142,9 @@ chmod -R u=rwX,g=rX,o=rX $RPM_BUILD_ROOT%{_docdir}/%{name}/html
 %doc %{_docdir}/%{name}/%{name}*.pdf
 
 %changelog
+* Tue Feb 01 2022 Michal Hlavinka <mhlavink@redhat.com> - 2.0.0-14
+- fix FTBFS (#2045213)
+
 * Wed Jan 19 2022 Fedora Release Engineering <releng@fedoraproject.org> - 2.0.0-13
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild