diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 4523692..b884e20 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -728,7 +728,7 @@
     msg "build: cmake, full config, clang" # ~ 50s
     scripts/config.pl full
     scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
-    CC=clang cmake -D CMAKE_BUILD_TYPE:String=Check -D ENABLE_TESTING=On .
+    CC=clang cmake -D LINK_WITH_PTHREAD=1 -D CMAKE_BUILD_TYPE:String=Check -D ENABLE_TESTING=On .
     make
 
     msg "test: main suites (full config)" # ~ 5s
@@ -750,7 +750,7 @@
     scripts/config.pl set MBEDTLS_DEPRECATED_WARNING
     # Build with -O -Wextra to catch a maximum of issues.
     make CC=gcc CFLAGS='-O -Werror -Wall -Wextra' lib programs
-    make CC=gcc CFLAGS='-O -Werror -Wall -Wextra -Wno-unused-function' tests
+    make PTHREAD=1 CC=gcc CFLAGS='-O -Werror -Wall -Wextra -Wno-unused-function' tests
 
     msg "build: make, full config + DEPRECATED_REMOVED, clang -O" # ~ 30s
     # No cleanup, just tweak the configuration and rebuild
@@ -759,7 +759,7 @@
     scripts/config.pl set MBEDTLS_DEPRECATED_REMOVED
     # Build with -O -Wextra to catch a maximum of issues.
     make CC=clang CFLAGS='-O -Werror -Wall -Wextra' lib programs
-    make CC=clang CFLAGS='-O -Werror -Wall -Wextra -Wno-unused-function' tests
+    make PTHREAD=1 CC=clang CFLAGS='-O -Werror -Wall -Wextra -Wno-unused-function' tests
 }
 
 
@@ -807,7 +807,7 @@
     scripts/config.pl unset MBEDTLS_PLATFORM_SNPRINTF_ALT
     scripts/config.pl unset MBEDTLS_ENTROPY_NV_SEED
     scripts/config.pl unset MBEDTLS_PLATFORM_C
-    make CC=gcc CFLAGS='-Werror -O1' all test
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -O1' all test
 }
 
 component_test_check_params_silent () {
@@ -815,7 +815,7 @@
     scripts/config.pl full # includes CHECK_PARAMS
     scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
     sed -i 's/.*\(#define MBEDTLS_PARAM_FAILED( cond )\).*/\1/' "$CONFIG_H"
-    make CC=gcc CFLAGS='-Werror -O1' all test
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -O1' all test
 }
 
 component_test_no_platform () {
@@ -837,8 +837,8 @@
     scripts/config.pl unset MBEDTLS_FS_IO
     # Note, _DEFAULT_SOURCE needs to be defined for platforms using glibc version >2.19,
     # to re-enable platform integration features otherwise disabled in C99 builds
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -std=c99 -pedantic -O0 -D_DEFAULT_SOURCE' lib programs
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -O0' test
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -std=c99 -pedantic -O0 -D_DEFAULT_SOURCE' lib programs
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -O0' test
 }
 
 component_build_no_std_function () {
@@ -847,21 +847,21 @@
     scripts/config.pl full
     scripts/config.pl set MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
     scripts/config.pl unset MBEDTLS_ENTROPY_NV_SEED
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -O0'
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -O0'
 }
 
 component_build_no_ssl_srv () {
     msg "build: full config except ssl_srv.c, make, gcc" # ~ 30s
     scripts/config.pl full
     scripts/config.pl unset MBEDTLS_SSL_SRV_C
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -O0'
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -O0'
 }
 
 component_build_no_ssl_cli () {
     msg "build: full config except ssl_cli.c, make, gcc" # ~ 30s
     scripts/config.pl full
     scripts/config.pl unset MBEDTLS_SSL_CLI_C
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -O0'
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -O0'
 }
 
 component_build_no_sockets () {
@@ -871,7 +871,7 @@
     scripts/config.pl full
     scripts/config.pl unset MBEDTLS_NET_C # getaddrinfo() undeclared, etc.
     scripts/config.pl set MBEDTLS_NO_PLATFORM_ENTROPY # uses syscall() on GNU/Linux
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -O0 -std=c99 -pedantic' lib
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -O0 -std=c99 -pedantic' lib
 }
 
 component_test_no_max_fragment_length () {
@@ -924,7 +924,7 @@
     scripts/config.pl set MBEDTLS_X509_ON_DEMAND_PARSING
     scripts/config.pl set MBEDTLS_THREADING_C
     scripts/config.pl set MBEDTLS_THREADING_PTHREAD
-    CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
+    CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan -D LINK_WITH_PTHREAD=1 .
     make
 
     msg "test: !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE, MBEDTLS_X509_ON_DEMAND_PARSING"
@@ -1024,7 +1024,7 @@
     # Build once with -O0, to compile out the i386 specific inline assembly
     msg "build: i386, make, gcc -O0 (ASan build)" # ~ 30s
     scripts/config.pl full
-    make CC=gcc CFLAGS='-O0 -Werror -Wall -Wextra -m32 -fsanitize=address'
+    make CC=gcc PTHREAD=1 CFLAGS='-O0 -Werror -Wall -Wextra -m32 -fsanitize=address'
 
     msg "test: i386, make, gcc -O0 (ASan build)"
     make test
@@ -1043,7 +1043,7 @@
     scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE
     scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
     scripts/config.pl unset MBEDTLS_MEMORY_DEBUG
-    make CC=gcc CFLAGS='-O1 -Werror -Wall -Wextra -m32 -fsanitize=address'
+    make CC=gcc PTHREAD=1 CFLAGS='-O1 -Werror -Wall -Wextra -m32 -fsanitize=address'
 
     msg "test: i386, make, gcc -O1 (ASan build)"
     make test
@@ -1058,7 +1058,7 @@
 component_test_mx32 () {
     msg "build: 64-bit ILP32, make, gcc" # ~ 30s
     scripts/config.pl full
-    make CC=gcc CFLAGS='-Werror -Wall -Wextra -mx32'
+    make CC=gcc PTHREAD=1 CFLAGS='-Werror -Wall -Wextra -mx32'
 
     msg "test: 64-bit ILP32, make, gcc"
     make test