diff --git a/file-5.10-strength.patch b/file-5.10-strength.patch
new file mode 100644
index 0000000..738b189
--- /dev/null
+++ b/file-5.10-strength.patch
@@ -0,0 +1,60 @@
+diff --git a/magic/Magdir/c-lang b/magic/Magdir/c-lang
+index 0665627..fdefa8c 100644
+--- a/magic/Magdir/c-lang
++++ b/magic/Magdir/c-lang
+@@ -6,26 +6,36 @@
+ # BCPL
+ 0	search/8192	"libhdr"	BCPL source text
+ !:mime	text/x-bcpl
++!:strength / 2
+ 0	search/8192	"LIBHDR"	BCPL source text
+ !:mime	text/x-bcpl
++!:strength / 2
+ 
+ # C
+ 0	regex	\^#include	C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	regex	\^char		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	regex	\^double		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	regex	\^extern		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	regex	\^float		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	regex	\^struct		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	regex	\^union		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 0	search/8192	main(		C source text
+ !:mime	text/x-c
++!:strength / 2
+ 
+ # C++
+ # The strength of these rules is increased so they beat the C rules above
+diff --git a/magic/Magdir/perl b/magic/Magdir/perl
+index e11f2ab..b02b2c2 100644
+--- a/magic/Magdir/perl
++++ b/magic/Magdir/perl
+@@ -28,10 +28,14 @@
+ # check the first line
+ 0	search/1	package
+ >0	regex		\^package[\ \t]+[0-9A-Za-z_:]+\ *;	Perl5 module source text
++# to be tried before C source
++!:strength + 5
+ # not 'p', check other lines
+ 0	search/1	!p
+ >0	regex		\^package[\ \t]+[0-9A-Za-z_:]+\ *;
+ >>0	regex		\^1\ *;|\^(use|sub|my)\ .*[(;{=]	Perl5 module source text
++# to be tried before C source
++!:strength + 40
+ 
+ 
+ 
diff --git a/file.spec b/file.spec
index f3665b6..7cf300a 100644
--- a/file.spec
+++ b/file.spec
@@ -5,7 +5,7 @@
 Summary: A utility for determining file types
 Name: file
 Version: 5.10
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: BSD
 Group: Applications/File
 Source0: ftp://ftp.astron.com/pub/file/file-%{version}.tar.gz
@@ -13,6 +13,7 @@ Source0: ftp://ftp.astron.com/pub/file/file-%{version}.tar.gz
 Patch0: file-localmagic.patch
 # sent upstream
 Patch1: file-tnef.patch
+Patch2: file-5.10-strength.patch
 URL: http://www.darwinsys.com/file/
 Requires: file-libs = %{version}-%{release}
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -68,6 +69,7 @@ file(1) command.
 %setup -q
 %patch0 -p1
 %patch1 -p1
+%patch2 -p1
 
 iconv -f iso-8859-1 -t utf-8 < doc/libmagic.man > doc/libmagic.man_
 touch -r doc/libmagic.man doc/libmagic.man_
@@ -152,6 +154,9 @@ rm -rf $RPM_BUILD_ROOT
 %endif
 
 %changelog
+* Tue Jan 10 2012 Jan Kaluza <jkaluza@redhat.com> - 5.10-4
+- fix #772651 - decrease strength of newly added "C source" patterns
+
 * Tue Jan 03 2012 Jan Kaluza <jkaluza@redhat.com> - 5.10-3
 - fix #771292 - do not show 'using regular magic file' warning for /etc/magic,
   because this file is not supposed to be compiled