8 files changed, 13 insertions, 13 deletions
diff --git a/sci-physics/espresso++/metadata.xml b/sci-physics/espresso++/metadata.xml
index 2f202fc50eda..35cad878fd2e 100644
--- a/sci-physics/espresso++/metadata.xml
+++ b/sci-physics/espresso++/metadata.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
 	<herd>sci-physics</herd>
diff --git a/sci-physics/hepmc/metadata.xml b/sci-physics/hepmc/metadata.xml
index 5733312e2b08..8b0128afb9b5 100644
--- a/sci-physics/hepmc/metadata.xml
+++ b/sci-physics/hepmc/metadata.xml
@@ -19,7 +19,7 @@
   Reference: M. Dobbs and J.B. Hansen, Comput. Phys. Commun. 134 (2001)41. 
 </longdescription>
 <use>
-  <flag name='gev'>Build with GeV instead of default MeV for momentum units</flag>
-  <flag name='cm'>Build with cm instead of default mm for length units</flag>
+  <flag name="gev">Build with GeV instead of default MeV for momentum units</flag>
+  <flag name="cm">Build with cm instead of default mm for length units</flag>
 </use>
 </pkgmetadata>
diff --git a/sci-physics/hoomd-blue/metadata.xml b/sci-physics/hoomd-blue/metadata.xml
index 89ca6381a77d..ace26cbf8399 100644
--- a/sci-physics/hoomd-blue/metadata.xml
+++ b/sci-physics/hoomd-blue/metadata.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
   <herd>sci-chemistry</herd>
diff --git a/sci-physics/lhapdf/metadata.xml b/sci-physics/lhapdf/metadata.xml
index 663117301f42..52920e3e368e 100644
--- a/sci-physics/lhapdf/metadata.xml
+++ b/sci-physics/lhapdf/metadata.xml
@@ -16,6 +16,6 @@
   installation of LHAPDF.
 </longdescription>
 <use>
-  <flag name='octave'>Add bindings for <pkg>sci-mathematics/octave</pkg></flag> 
+  <flag name="octave">Add bindings for <pkg>sci-mathematics/octave</pkg></flag> 
 </use>
 </pkgmetadata>
diff --git a/sci-physics/meep/metadata.xml b/sci-physics/meep/metadata.xml
index 17865fb063ef..867251312e30 100644
--- a/sci-physics/meep/metadata.xml
+++ b/sci-physics/meep/metadata.xml
@@ -9,6 +9,6 @@
   eigenmode package.
 </longdescription>
 <use>
-  <flag name='mpb'>Enable build against <pkg>sci-physics/mpb</pkg></flag>
+  <flag name="mpb">Enable build against <pkg>sci-physics/mpb</pkg></flag>
 </use>
 </pkgmetadata>
diff --git a/sci-physics/sassena/metadata.xml b/sci-physics/sassena/metadata.xml
index fb807daf7a9c..b0d4622c2230 100644
--- a/sci-physics/sassena/metadata.xml
+++ b/sci-physics/sassena/metadata.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
 	<maintainer>
diff --git a/sci-physics/thepeg/metadata.xml b/sci-physics/thepeg/metadata.xml
index 60bfa04d6dd2..35a029dea9d2 100644
--- a/sci-physics/thepeg/metadata.xml
+++ b/sci-physics/thepeg/metadata.xml
@@ -13,12 +13,12 @@
   of the toolkit and which can be used by any event generator model.
 </longdescription>
 <use>
-  <flag name='c++11'>Build ThePEG using the C++11 standard.
+  <flag name="c++11">Build ThePEG using the C++11 standard.
   Experimental feature, not for production use.</flag>
-  <flag name='fastjet'>Adds support for <pkg>sci-physics/fastjet</pkg></flag>
-  <flag name='hepmc'>Adds support for High Energy Physics Monte Carlo
+  <flag name="fastjet">Adds support for <pkg>sci-physics/fastjet</pkg></flag>
+  <flag name="hepmc">Adds support for High Energy Physics Monte Carlo
 	  Generators <pkg>sci-physics/hepmc</pkg></flag>
-  <flag name='lhapdf'>Adds support for <pkg>sci-physics/lhapdf</pkg></flag>
-  <flag name='rivet'>Adds support for <pkg>sci-physics/rivet</pkg></flag>
+  <flag name="lhapdf">Adds support for <pkg>sci-physics/lhapdf</pkg></flag>
+  <flag name="rivet">Adds support for <pkg>sci-physics/rivet</pkg></flag>
 </use>
 </pkgmetadata>
diff --git a/sci-physics/yoda/metadata.xml b/sci-physics/yoda/metadata.xml
index b221b3a1213e..04e893cde1f3 100644
--- a/sci-physics/yoda/metadata.xml
+++ b/sci-physics/yoda/metadata.xml
@@ -11,6 +11,6 @@
 </longdescription>
 <use>
   <flag name="c++11"> Build using the C++11 standard</flag>
-  <flag name='root'>Adds support for <pkg>sci-physics/root</pkg></flag>
+  <flag name="root">Adds support for <pkg>sci-physics/root</pkg></flag>
 </use>
 </pkgmetadata>