diff --git a/INSTALL b/INSTALL
index 63630b8..9ed4202 100644
--- a/INSTALL
+++ b/INSTALL
@@ -254,12 +254,12 @@ Installing the C Library
 ========================
 
 To install the library and its header files, and the Info files of the
-manual, type `env LANGUAGE=C LC_ALL=C make install'.  This will build
-things, if necessary, before installing them; however, you should still
-compile everything first.  If you are installing the GNU C Library as
-your primary C library, we recommend that you shut the system down to
-single-user mode first, and reboot afterward.  This minimizes the risk
-of breaking things when the library changes out from underneath.
+manual, type `make install'.  This will build things, if necessary,
+before installing them; however, you should still compile everything
+first.  If you are installing the GNU C Library as your primary C
+library, we recommend that you shut the system down to single-user mode
+first, and reboot afterward.  This minimizes the risk of breaking
+things when the library changes out from underneath.
 
    `make install' will do the entire job of upgrading from a previous
 installation of the GNU C Library version 2.x.  There may sometimes be
diff --git a/Makefile b/Makefile
index 2eab98c..ad18034 100644
--- a/Makefile
+++ b/Makefile
@@ -105,7 +105,7 @@ install-symbolic-link: subdir_install
 	rm -f $(symbolic-link-list)
 
 install:
-	-test ! -x $(elf-objpfx)ldconfig || LC_ALL=C LANGUAGE=C \
+	-test ! -x $(elf-objpfx)ldconfig || LC_ALL=C \
 	  $(elf-objpfx)ldconfig $(addprefix -r ,$(install_root)) \
 				$(slibdir) $(libdir)
 ifneq (no,$(PERL))
diff --git a/Makefile.in b/Makefile.in
index 945bc32..710ce7e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -9,7 +9,7 @@ all .DEFAULT:
 	$(MAKE) -r PARALLELMFLAGS="$(PARALLELMFLAGS)" -C $(srcdir) objdir=`pwd` $@
 
 install:
-	LANGUAGE=C LC_ALL=C; export LANGUAGE LC_ALL; \
+	LC_ALL=C; export LC_ALL; \
 	$(MAKE) -r PARALLELMFLAGS="$(PARALLELMFLAGS)" -C $(srcdir) objdir=`pwd` $@
 
 bench bench-clean:
diff --git a/assert/Makefile b/assert/Makefile
index 97fb476..3ed21be 100644
--- a/assert/Makefile
+++ b/assert/Makefile
@@ -28,6 +28,3 @@ routines := assert assert-perr __assert
 tests := test-assert test-assert-perr
 
 include ../Rules
-
-test-assert-ENV = LANGUAGE=C
-test-assert-perr-ENV = LANGUAGE=C
diff --git a/elf/Makefile b/elf/Makefile
index eb16c59..a2f5ce5 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -591,7 +591,6 @@ $(objpfx)neededtest3: $(libdl)
 $(objpfx)neededtest3.out: $(objpfx)neededobj1.so $(objpfx)neededobj2.so \
 			  $(objpfx)neededobj3.so $(objpfx)neededobj4.so
 
-neededtest4-ENV = LC_ALL=C LANGUAGE=C
 $(objpfx)neededtest4: $(libdl) $(objpfx)neededobj1.so
 $(objpfx)neededtest4.out: $(objpfx)neededobj5.so $(objpfx)neededobj6.so
 
diff --git a/iconvdata/Makefile b/iconvdata/Makefile
index 8fb746e..424e8ee 100644
--- a/iconvdata/Makefile
+++ b/iconvdata/Makefile
@@ -251,7 +251,7 @@ ifeq (no,$(cross-compiling))
 # Update the $(prefix)/lib/gconv/gconv-modules.cache file. This is necessary
 # if this libc has more gconv modules than the previously installed one.
 	if test -f "$(inst_gconvdir)/gconv-modules.cache"; then \
-	   LC_ALL=C LANGUAGE=C \
+	   LC_ALL=C \
 	   $(elf-objpfx)ld.so --library-path $(rpath-link) \
 	   $(common-objpfx)iconv/iconvconfig \
 	     $(addprefix --prefix=,$(install_root)); \
diff --git a/io/ftwtest-sh b/io/ftwtest-sh
index db1c6bc..3a9e8f4 100644
--- a/io/ftwtest-sh
+++ b/io/ftwtest-sh
@@ -40,8 +40,6 @@ fi
 # Since we use `sort' we must make sure to use the same locale everywhere.
 LC_ALL=C
 export LC_ALL
-LANG=C
-export LANG
 
 # First create our scenario:
 tmp=${objpfx}io
diff --git a/libio/Makefile b/libio/Makefile
index 4552360..56952ce 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -148,7 +148,6 @@ CFLAGS-tst_putwc.c = -DOBJPFX=\"$(objpfx)\"
 
 tst_wprintf2-ARGS = "Some Text"
 
-tst-widetext-ENV = LANGUAGE=C
 tst-fopenloc-ENV = MALLOC_TRACE=$(objpfx)tst-fopenloc.mtrace
 
 generated += tst-fopenloc.mtrace tst-fopenloc.check
diff --git a/localedata/tst-fmon.sh b/localedata/tst-fmon.sh
index 7f1b248..275428e 100755
--- a/localedata/tst-fmon.sh
+++ b/localedata/tst-fmon.sh
@@ -37,7 +37,7 @@ for cns in `cd ./tst-fmon-locales && ls tstfmon_*`; do
     fn=charmaps/ISO-8859-1
     ${run_program_prefix_before_env} \
     ${run_program_env} \
-    I18NPATH=. LANGUAGE=C \
+    I18NPATH=. \
     ${run_program_prefix_after_env} ${common_objpfx}locale/localedef \
     --quiet -i $cn -f $fn ${common_objpfx}localedata/$cns
 done
diff --git a/localedata/tst-locale.sh b/localedata/tst-locale.sh
index 7c71dcf..7942a69 100755
--- a/localedata/tst-locale.sh
+++ b/localedata/tst-locale.sh
@@ -36,7 +36,7 @@ test_locale ()
     fi
     ${localedef_before_env} \
     ${run_program_env} \
-    I18NPATH=. LANGUAGE=C \
+    I18NPATH=. \
     ${localedef_after_env} --quiet -c -f $charmap -i $input \
       ${rep} ${common_objpfx}localedata/$out
 
diff --git a/manual/install.texi b/manual/install.texi
index 08851e1..6ca3ea1 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -291,7 +291,7 @@ the last assignment specified must take precedence.
 @cindex installing
 
 To install the library and its header files, and the Info files of the
-manual, type @code{env LANGUAGE=C LC_ALL=C make install}.  This will
+manual, type @code{make install}.  This will
 build things, if necessary, before installing them; however, you should
 still compile everything first.  If you are installing @theglibc{} as your
 primary C library, we recommend that you shut the system down to
diff --git a/nptl/tst-tls6.sh b/nptl/tst-tls6.sh
index 2d31826..846c321 100755
--- a/nptl/tst-tls6.sh
+++ b/nptl/tst-tls6.sh
@@ -36,7 +36,7 @@ for aligned in a e f; do
   echo "preload tst-tls5mod{$aligned,b,c,d}.so" >> $logfile
   echo "===============" >> $logfile
   ${test_wrapper_env} \
-  ${run_program_env} LANG=C \
+  ${run_program_env} \
   LD_PRELOAD="`echo ${common_objpfx}nptl/tst-tls5mod{$aligned,b,c,d}.so \
 	      | sed 's/:$//;s/: /:/g'`" ${tst_tls5} >> $logfile || fail=1
   echo >> $logfile
@@ -44,7 +44,7 @@ for aligned in a e f; do
   echo "preload tst-tls5mod{b,$aligned,c,d}.so" >> $logfile
   echo "===============" >> $logfile
   ${test_wrapper_env} \
-  ${run_program_env} LANG=C \
+  ${run_program_env} \
   LD_PRELOAD="`echo ${common_objpfx}nptl/tst-tls5mod{b,$aligned,c,d}.so \
 	      | sed 's/:$//;s/: /:/g'`" ${tst_tls5} >> $logfile || fail=1
   echo >> $logfile
@@ -52,7 +52,7 @@ for aligned in a e f; do
   echo "preload tst-tls5mod{b,c,d,$aligned}.so" >> $logfile
   echo "===============" >> $logfile
   ${test_wrapper_env} \
-  ${run_program_env} LANG=C \
+  ${run_program_env} \
   LD_PRELOAD="`echo ${common_objpfx}nptl/tst-tls5mod{b,c,d,$aligned}.so \
 	      | sed 's/:$//;s/: /:/g'`" ${tst_tls5} >> $logfile || fail=1
   echo >> $logfile
@@ -61,7 +61,7 @@ done
 echo "preload tst-tls5mod{d,a,b,c,e}" >> $logfile
 echo "===============" >> $logfile
 ${test_wrapper_env} \
-${run_program_env} LANG=C \
+${run_program_env} \
 LD_PRELOAD="`echo ${common_objpfx}nptl/tst-tls5mod{d,a,b,c,e}.so \
 	    | sed 's/:$//;s/: /:/g'`" ${tst_tls5} >> $logfile || fail=1
 echo >> $logfile
@@ -69,7 +69,7 @@ echo >> $logfile
 echo "preload tst-tls5mod{d,a,b,e,f}" >> $logfile
 echo "===============" >> $logfile
 ${test_wrapper_env} \
-${run_program_env} LANG=C \
+${run_program_env} \
 LD_PRELOAD="`echo ${common_objpfx}nptl/tst-tls5mod{d,a,b,e,f}.so \
 	    | sed 's/:$//;s/: /:/g'`" ${tst_tls5} >> $logfile || fail=1
 echo >> $logfile
diff --git a/posix/globtest.sh b/posix/globtest.sh
index d76fc6c..77f0094 100755
--- a/posix/globtest.sh
+++ b/posix/globtest.sh
@@ -40,8 +40,6 @@ esac
 # Since we use `sort' we must make sure to use the same locale everywhere.
 LC_ALL=C
 export LC_ALL
-LANG=C
-export LANG
 
 # Create the arena
 testdir=${common_objpfx}posix/globtest-dir
diff --git a/string/Makefile b/string/Makefile
index 70b9c19..98c2961 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -64,9 +64,6 @@ endif
 
 include ../Rules
 
-tester-ENV = LANGUAGE=C
-inl-tester-ENV = LANGUAGE=C
-noinl-tester-ENV = LANGUAGE=C
 CFLAGS-inl-tester.c = -fno-builtin
 CFLAGS-noinl-tester.c = -fno-builtin
 CFLAGS-tst-strlen.c = -fno-builtin
diff --git a/sysdeps/s390/s390-64/Makefile b/sysdeps/s390/s390-64/Makefile
index 9fee71b..4e69e90 100644
--- a/sysdeps/s390/s390-64/Makefile
+++ b/sysdeps/s390/s390-64/Makefile
@@ -76,7 +76,7 @@ ifeq (no,$(cross-compiling))
 # Update the $(prefix)/lib/gconv/gconv-modules.cache file. This is necessary
 # if this libc has more gconv modules than the previously installed one.
 	if test -f "$(inst_gconvdir)/gconv-modules.cache"; then \
-	   LC_ALL=C LANGUAGE=C \
+	   LC_ALL=C \
 	   $(elf-objpfx)ld.so --library-path $(rpath-link) \
 	   $(common-objpfx)iconv/iconvconfig \
 	     $(addprefix --prefix=,$(install_root)); \
diff --git a/timezone/Makefile b/timezone/Makefile
index d10c3a5..6e008bc 100644
--- a/timezone/Makefile
+++ b/timezone/Makefile
@@ -80,8 +80,7 @@ CFLAGS-scheck.c = -Wno-strict-prototypes -DNOID -DHAVE_GETTEXT
 # Don't add leapseconds here since test-tz made checks that work only without
 # leapseconds.
 define build-testdata
-$(built-program-cmd-before-env) $(run-program-env) LANGUAGE=C \
-  $(built-program-cmd-after-env) -d $(testdata) -y ./yearistype $<; \
+$(built-program-cmd) -d $(testdata) -y ./yearistype $<; \
 $(evaluate-test)
 endef
 
