diff --git a/xdrawchem-include-header.patch b/xdrawchem-include-header.patch
new file mode 100644
index 0000000..f1c34b6
--- /dev/null
+++ b/xdrawchem-include-header.patch
@@ -0,0 +1,10 @@
+--- xdrawchem-1.9.9/xdrawchem/application.cpp.compile	2005-11-16 12:01:55.000000000 +0900
++++ xdrawchem-1.9.9/xdrawchem/application.cpp	2012-08-01 15:57:31.545768999 +0900
+@@ -14,6 +14,7 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <errno.h>
++#include <unistd.h>
+ 
+ using std::cout;
+ using std::endl;
diff --git a/xdrawchem.spec b/xdrawchem.spec
index 2340702..cd86fc4 100644
--- a/xdrawchem.spec
+++ b/xdrawchem.spec
@@ -1,12 +1,13 @@
 Name: 		xdrawchem
 Version: 	1.9.9
-Release: 	18%{?dist}
+Release: 	19%{?dist}
 Summary: 	2D chemical structures drawing tool
 Source0:	http://downloads.sourceforge.net/sourceforge/xdrawchem/%{name}-%{version}.tar.gz
 Source1:	%{name}.desktop
 Patch0:		%{name}-gcc43.patch
 Patch1:		%{name}-ob22.patch
 Patch2:		%{name}-warn.patch
+Patch3:		%{name}-include-header.patch
 URL: 		http://xdrawchem.sourceforge.net/
 License: 	GPLv2+
 Group: 		Applications/Engineering
@@ -28,6 +29,7 @@ XDrawChem and other chemistry applications.
 %patch0 -p1 -b .gcc43
 %patch1 -p1 -b .ob
 %patch2 -p1 -b .warn
+%patch3 -p1 -b .include
 
 %build
 %configure \
@@ -72,6 +74,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %{_datadir}/icons/hicolor/*/apps/xdrawchem.png
 
 %changelog
+* Wed Aug  1 2012 Mamoru Tasaka <mtasaka@fedoraproject.org> - 1.9.9-19
+- Fix build error by including needed header
+
 * Sun Jul 22 2012 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.9.9-18
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_18_Mass_Rebuild