diff --git a/configure b/configure
index 723d2f51c7..ab339fce17 100755
--- a/configure
+++ b/configure
@@ -23678,21 +23678,6 @@ case "$host_cpu-$host_vendor-$host_os" in
     ## Need to add this so that O_DIRECT is visible for the direct
     ## VFD on Linux systems.
     H5_CPPFLAGS="-D_GNU_SOURCE $H5_CPPFLAGS"
-
-    ## Also add BSD support on Linux systems, so <features.h> defines
-    ## __USE_BSD, which is required to get the prototype for strdup
-    ## defined correctly in <string.h> and snprintf & vsnprintf defined
-    ## correctly in <stdio.h>
-    ## Linking to the bsd-compat library is required as per the gcc manual:
-    ## http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
-    ## however, we do not do this since it breaks the big test on some
-    ## older platforms.
-    H5_CPPFLAGS="-D_BSD_SOURCE $H5_CPPFLAGS"
-
-    ## _BSD_SOURCE is deprecated as of glibc 2.20, in favor of _DEFAULT_SOURCE.
-    ## To avoid warnings, we define _DEFAULT_SOURCE in addition to _BSD_SOURCE,
-    ## which should work for all versions of glibc.
-    H5_CPPFLAGS="-D_DEFAULT_SOURCE $H5_CPPFLAGS"
     ;;
 esac
 
diff --git a/configure.ac b/configure.ac
index 32afb44132..d9df594f58 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1092,21 +1092,6 @@ case "$host_cpu-$host_vendor-$host_os" in
     ## Need to add this so that O_DIRECT is visible for the direct
     ## VFD on Linux systems.
     H5_CPPFLAGS="-D_GNU_SOURCE $H5_CPPFLAGS"
-
-    ## Also add BSD support on Linux systems, so <features.h> defines
-    ## __USE_BSD, which is required to get the prototype for strdup
-    ## defined correctly in <string.h> and snprintf & vsnprintf defined
-    ## correctly in <stdio.h>
-    ## Linking to the bsd-compat library is required as per the gcc manual:
-    ## http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
-    ## however, we do not do this since it breaks the big test on some
-    ## older platforms.
-    H5_CPPFLAGS="-D_BSD_SOURCE $H5_CPPFLAGS"
-
-    ## _BSD_SOURCE is deprecated as of glibc 2.20, in favor of _DEFAULT_SOURCE.
-    ## To avoid warnings, we define _DEFAULT_SOURCE in addition to _BSD_SOURCE,
-    ## which should work for all versions of glibc.
-    H5_CPPFLAGS="-D_DEFAULT_SOURCE $H5_CPPFLAGS"
     ;;
 esac