3 files changed, 17 insertions, 1 deletions
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 912132dbc5b..157b504ea6a 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -778,6 +778,10 @@
 /* Define bytes to use libc memset(). */
 #undef MEMSET_LOOP_LIMIT
 
+/* Define to the OpenSSL API version in use. This avoids deprecation warnings
+   from newer OpenSSL versions. */
+#undef OPENSSL_API_COMPAT
+
 /* Define to the address where bug reports for this package should be sent. */
 #undef PACKAGE_BUGREPORT
 
diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32
index 9510b982160..7fa151f41b4 100644
--- a/src/include/pg_config.h.win32
+++ b/src/include/pg_config.h.win32
@@ -628,6 +628,10 @@
 /* Define bytes to use libc memset(). */
 #define MEMSET_LOOP_LIMIT 1024
 
+/* Define to the OpenSSL API version in use. This avoids deprecation warnings
+   from newer OpenSSL versions. */
+#define OPENSSL_API_COMPAT 0x00908000L
+
 /* Define to the address where bug reports for this package should be sent. */
 #define PACKAGE_BUGREPORT "pgsql-bugs@postgresql.org"
 
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 984d63f5d77..c823655ed9a 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -151,6 +151,8 @@ sub GenerateFiles
 {
 	my $self = shift;
 	my $bits = $self->{platform} eq 'Win32' ? 32 : 64;
+	my $openssl_api_compat;
+	my $ac_define_openssl_api_compat_found = 0;
 
 	# Parse configure.in to get version numbers
 	open(my $c, '<', "configure.in")
@@ -167,10 +169,15 @@ sub GenerateFiles
 			$self->{numver} = sprintf("%d%04d", $1, $2 ? $2 : 0);
 			$self->{majorver} = sprintf("%d", $1);
 		}
+		elsif (/\bAC_DEFINE\(OPENSSL_API_COMPAT, \[([0-9xL]+)\]/)
+		{
+			$ac_define_openssl_api_compat_found = 1;
+			$openssl_api_compat = $1;
+		}
 	}
 	close($c);
 	confess "Unable to parse configure.in for all variables!"
-	  if ($self->{strver} eq '' || $self->{numver} eq '');
+	  if ($self->{strver} eq '' || $self->{numver} eq '' || $ac_define_openssl_api_compat_found == 0);
 
 	if (IsNewer("src/include/pg_config_os.h", "src/include/port/win32.h"))
 	{
@@ -254,6 +261,7 @@ sub GenerateFiles
 		if ($self->{options}->{openssl})
 		{
 			print $o "#define USE_OPENSSL 1\n";
+			print $o "#define OPENSSL_API_COMPAT $openssl_api_compat\n";
 
 			my ($digit1, $digit2, $digit3) = $self->GetOpenSSLVersion();