diff --git a/documentation/content/en/books/porters-handbook/makefiles/_index.adoc b/documentation/content/en/books/porters-handbook/makefiles/_index.adoc
--- a/documentation/content/en/books/porters-handbook/makefiles/_index.adoc
+++ b/documentation/content/en/books/porters-handbook/makefiles/_index.adoc
@@ -2554,6 +2554,8 @@
 LICENSE_FILE=	${WRKSRC}/COPYING
 ....
 
+However, please do not use `LICENSE_FILE` for the GNU General Public License (`GPLv1`, `GPLv1+`, `GPL2`, `GPLv2+`, `GPLv3`, `GPLv3+`) to avoid installing on our systems multiple copies of the same identical files.
+
 ====
 
 For the predefined licenses, the default permissions are `dist-mirror dist-sell pkg-mirror pkg-sell auto-accept`.
@@ -3203,6 +3205,7 @@
 
 Full path to the file containing the license text, usually [.filename]#${WRKSRC}/some/file#.
 If the file is not in the distfile, and its content is too long to be put in <<licenses-license_text,`LICENSE_TEXT`>>, put it in a new file in [.filename]#${FILESDIR}#.
+Please do not use `LICENSE_FILE` for the GNU General Public License (`GPLv1`, `GPLv1+`, `GPL2`, `GPLv2+`, `GPLv3`, `GPLv3+`) to avoid installing on our systems multiple copies of the same identical files.
 
 [[licenses-license_file-ex1]]
 .`LICENSE_FILE`
@@ -3211,8 +3214,8 @@
 
 [.programlisting]
 ....
-LICENSE=	GPLv3+
-LICENSE_FILE=	${WRKSRC}/COPYING
+LICENSE=	BSD2CLAUSE
+LICENSE_FILE=	${WRKSRC}/LICENSE
 ....
 
 ====
@@ -3294,10 +3297,10 @@
 
 [.programlisting]
 ....
-LICENSE=	ART10 GPLv1
+LICENSE=	ART10 BSD2CLAUSE
 LICENSE_COMB=   dual
 LICENSE_FILE_ART10=     ${WRKSRC}/Artistic
-LICENSE_FILE_GPLv1=     ${WRKSRC}/Copying
+LICENSE_FILE_BSD2CLAUSE=     ${WRKSRC}/LICENSE
 ....
 
 ====