diff --git a/INSTALL-gwnum b/INSTALL-gwnum
index 76ca14f34b3f0715f0d581332923b05213e09c46..8b1b65cb88291040896cf5ba2583a126af53da2c 100644
--- a/INSTALL-gwnum
+++ b/INSTALL-gwnum
@@ -6,9 +6,9 @@ is not affected.
 Users should familiarize themselves with the instructions in
 "INSTALL-ecm" before attempting the procedures here.
 
-0) Download Prime 95 source files. As of March 2024, the current release is:
+0) Download Prime 95 source files. As of June 2024, the current release is:
 
-   https://www.mersenne.org/download/software/v30/30.19/p95v3019b13.source.zip
+   https://www.mersenne.org/download/software/v30/30.19/p95v3019b20.source.zip
    
    Check links appended to "https://www.mersenne.org/download/software/" for
    future Prime 95 releases.
@@ -40,7 +40,7 @@ Users should familiarize themselves with the instructions in
    For example, if the ECM and p95 folders are both in the same home folder,
    the command might look like
 
-   $ ./configure --with-gwnum=../p95v3019b13.source/gwnum
+   $ ./configure --with-gwnum=../p95v3019b20.source/gwnum
    
    Note that you may also need to specify "--with-gmp=<gmpdir>" if
    "configure" has trouble finding GMP.
@@ -73,7 +73,7 @@ Users should familiarize themselves with the instructions in
        with 'n' or '(b2^n2)' < 10^10. Also, k must be a positive integer with
        1 <= k < 2^53, and c must be a non-zero integer with |c| < 2^23.
        Note that the k upper limit of 2^53-1 is taken from the file
-       p95v3019b13.source/gwnum/gwnum.c, line 2181:
+       p95v3019b20.source/gwnum/gwnum.c, line 2181:
        "if (k > 9007199254740991.0) return (GWERROR_K_TOO_LARGE);"
        and is subject to change by Woltman.
    (2) For integer-character-only input strings N, GMP-ECM may detect if
diff --git a/LucasChainGenerator/src/LucasChainGen.c b/LucasChainGenerator/src/LucasChainGen.c
index a53d1d44eb67988ecf4d9266302c1f0602af6bcf..a88dd23f76c6ee0e84da893267f01f972e1de354 100644
--- a/LucasChainGenerator/src/LucasChainGen.c
+++ b/LucasChainGenerator/src/LucasChainGen.c
@@ -24,7 +24,7 @@ http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
-#ifndef _MSC_VER
+#ifdef HAVE_SYS_RESOURCE_H
 #  include <sys/resource.h>
 #endif
 #include <time.h>
diff --git a/gwnum_linux.sh b/gwnum_linux.sh
index 47b8beafa91334ea3bf679cca5657842f5a46043..c5ca6a2550b937234c994290605bf59d1fe51ebc 100755
--- a/gwnum_linux.sh
+++ b/gwnum_linux.sh
@@ -1,7 +1,7 @@
 #! /bin/sh
 
-P95_URL="https://www.mersenne.org/download/software/v30/30.19/p95v3019b13.source.zip"
-echo "Loading P95 version 30.19 build 13"
+P95_URL="https://www.mersenne.org/download/software/v30/30.19/p95v3019b20.source.zip"
+echo "Loading P95 version 30.19 build 20"
 [ -d "/tmp/P95/" ] && rm -r /tmp/P95
 mkdir /tmp/P95
 wget -q -O /tmp/P95/P95_source.zip $P95_URL