diff -Nru paparazzi-jsbsim-1.7/debian/changelog paparazzi-jsbsim-1.7/debian/changelog
--- paparazzi-jsbsim-1.7/debian/changelog	2021-03-12 16:43:26.000000000 +0000
+++ paparazzi-jsbsim-1.7/debian/changelog	2021-03-12 17:23:49.000000000 +0000
@@ -1,3 +1,9 @@
+paparazzi-jsbsim (1.7-1) focal; urgency=medium
+
+  * conditional compilation x86
+
+ -- Gautier Hattenberger <gautier.hattenberger@enac.fr>  Fri, 12 Mar 2021 18:23:49 +0100
+
 paparazzi-jsbsim (1.7) focal; urgency=medium
 
   * use upstream version 1.1.5 without patches (pkg-config file is now
diff -Nru paparazzi-jsbsim-1.7/debian/rules paparazzi-jsbsim-1.7/debian/rules
--- paparazzi-jsbsim-1.7/debian/rules	2021-03-12 16:43:26.000000000 +0000
+++ paparazzi-jsbsim-1.7/debian/rules	2021-03-12 17:23:49.000000000 +0000
@@ -23,7 +23,14 @@
 	GZIP='--best --no-name' tar -cz --owner root --group root --mode a+rX -f paparazzi-jsbsim_$(VER).orig.tar.gz paparazzi-jsbsim-$(VER)
 	rm -rf paparazzi-jsbsim-$(VER)
 
+ifeq ($(shell uname -m), x86_64)
+# options for old cpu on amd64 arch
+OPTIONS = -mno-avx -mno-avx2 -mno-bmi -mno-bmi2
+else
+OPTIONS =
+endif
+
 
 override_dh_auto_configure:
-	cmake -DCMAKE_CXX_FLAGS_RELEASE="-O3 -march=native -mtune=native -mno-avx -mno-avx2 -mno-bmi -mno-bmi2" -DCMAKE_C_FLAGS_RELEASE="-O3 -march=native -mtune=native -mno-avx -mno-avx2 -mno-bmi -mno-bmi2" -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=/usr .
+	cmake -DCMAKE_CXX_FLAGS_RELEASE="-O3 -march=native -mtune=native $(OPTIONS)" -DCMAKE_C_FLAGS_RELEASE="-O3 -march=native -mtune=native $(OPTIONS)" -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=/usr .