diff -Naur cernlib-20061220+dfsg3.original/debian/patches/102-dont-optimize-some-code.dpatch cernlib-20061220+dfsg3/debian/patches/102-dont-optimize-some-code.dpatch
--- cernlib-20061220+dfsg3.original/debian/patches/102-dont-optimize-some-code.dpatch	2017-08-06 19:23:39.000000000 +0000
+++ cernlib-20061220+dfsg3/debian/patches/102-dont-optimize-some-code.dpatch	2019-02-03 21:49:52.638404057 +0000
@@ -20,7 +20,7 @@
 +#endif
 +
 +/* GCC 7 on 64bit targets, see https://gcc.gnu.org/PR81723 */
-+SpecialFortranLibObjectRule(cwerf64,cwerf64,-O2,NullParameter)
++SpecialFortranLibObjectRule(cwerf64,cwerf64,-O,NullParameter)
 diff -urNad cernlib-2006.dfsg.2~/src/mathlib/gen/d/Imakefile cernlib-2006.dfsg.2/src/mathlib/gen/d/Imakefile
 --- cernlib-2006.dfsg.2~/src/mathlib/gen/d/Imakefile	1996-06-12 08:25:38.000000000 -0700
 +++ cernlib-2006.dfsg.2/src/mathlib/gen/d/Imakefile	2008-02-22 12:06:26.000000000 -0800
diff -Naur cernlib-20061220+dfsg3.original/debian/patches/126-fix-patchy-compile-flags.dpatch cernlib-20061220+dfsg3/debian/patches/126-fix-patchy-compile-flags.dpatch
--- cernlib-20061220+dfsg3.original/debian/patches/126-fix-patchy-compile-flags.dpatch	2013-08-24 09:16:07.000000000 +0000
+++ cernlib-20061220+dfsg3/debian/patches/126-fix-patchy-compile-flags.dpatch	2019-02-03 21:48:36.151806615 +0000
@@ -76,7 +76,7 @@
  
 -      PARAMETER   (CHPOF = '-c -O -fno-automatic')
 -      PARAMETER   (CHPOC = '-c -O2 -m486')
-+      PARAMETER   (CHPOF = '-c -g -O2 -fno-automatic')
++      PARAMETER   (CHPOF = '-c -g -O -fno-automatic')
 +      PARAMETER   (CHPOC = '-c -g -O2')
        PARAMETER   (CHPOA = ' ')
  
diff -Naur cernlib-20061220+dfsg3.original/debian/patches/304-update-Imake-config-files.dpatch cernlib-20061220+dfsg3/debian/patches/304-update-Imake-config-files.dpatch
--- cernlib-20061220+dfsg3.original/debian/patches/304-update-Imake-config-files.dpatch	2015-09-09 01:24:30.000000000 +0000
+++ cernlib-20061220+dfsg3/debian/patches/304-update-Imake-config-files.dpatch	2019-02-03 21:47:38.208869466 +0000
@@ -1794,7 +1794,7 @@
 +
 +#ifdef AMD64Architecture
 +# ifndef OptimizationLevel
-+#  define OptimizationLevel	-O3
++#  define OptimizationLevel	-O
 +# endif
 +# ifndef OptimizedCDebugFlags
 +#  define OptimizedCDebugFlags  OptimizationLevel