Created mechanism to provide development team ID which is git friendly.

Please see XCodeConfig.xcconfig for details.

sys/unix/.gitignore

@@ -0,0 +1 @@
+XCodeLocal.xcconfig

sys/unix/NetHack.xcodeproj/project.pbxproj

@@ -330,6 +330,7 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		2A953FB221A3F404007906E5 /* XCode.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = XCode.xcconfig; sourceTree = "<group>"; };
 		3189577121A1FCC100FB2ABE /* NetHack */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = NetHack; sourceTree = BUILT_PRODUCTS_DIR; };
 		3189577F21A1FDA400FB2ABE /* makedefs */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = makedefs; sourceTree = BUILT_PRODUCTS_DIR; };
 		3192867B21A3ACAB00325BEB /* lev_comp.y */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.yacc; name = lev_comp.y; path = ../../util/lev_comp.y; sourceTree = "<group>"; };
@@ -530,6 +531,7 @@
 		3189576821A1FCC100FB2ABE = {
 			isa = PBXGroup;
 			children = (
+				2A953FB221A3F404007906E5 /* XCode.xcconfig */,
 				31B8A3F821A23E490055BD01 /* win */,
 				31B8A3E921A23CC40055BD01 /* sys */,
 				3189579621A2046700FB2ABE /* include */,
@@ -1732,6 +1734,7 @@
 /* Begin XCBuildConfiguration section */
 		3189577621A1FCC100FB2ABE /* Debug */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 2A953FB221A3F404007906E5 /* XCode.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -1813,6 +1816,7 @@
 		};
 		3189577721A1FCC100FB2ABE /* Release */ = {
 			isa = XCBuildConfiguration;
+			baseConfigurationReference = 2A953FB221A3F404007906E5 /* XCode.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
 				CLANG_ANALYZER_NONNULL = YES;
@@ -1889,7 +1893,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				OTHER_CFLAGS = (
 					"-DNOMAIL",
 					"-DNOTPARMDECL",
@@ -1910,7 +1913,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				OTHER_CFLAGS = (
 					"-DNOMAIL",
 					"-DNOTPARMDECL",
@@ -1931,7 +1933,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -1940,7 +1941,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -1951,7 +1951,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1964,7 +1963,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1977,7 +1975,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1990,7 +1987,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -2003,7 +1999,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -2016,7 +2011,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -2029,7 +2023,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -2042,7 +2035,6 @@
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
-				DEVELOPMENT_TEAM = T4L96T5775;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";

sys/unix/NetHack.xcodeproj/xcshareddata/xcschemes/recover.xcscheme

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1010"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "31B8A44921A26A4B0055BD01"
+               BuildableName = "recover"
+               BlueprintName = "recover"
+               ReferencedContainer = "container:NetHack.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "31B8A44921A26A4B0055BD01"
+            BuildableName = "recover"
+            BlueprintName = "recover"
+            ReferencedContainer = "container:NetHack.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "31B8A44921A26A4B0055BD01"
+            BuildableName = "recover"
+            BlueprintName = "recover"
+            ReferencedContainer = "container:NetHack.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "31B8A44921A26A4B0055BD01"
+            BuildableName = "recover"
+            BlueprintName = "recover"
+            ReferencedContainer = "container:NetHack.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

sys/unix/XCode.xcconfig

@@ -0,0 +1,38 @@
+//  XCodeConfig.xcconfig
+//  NetHack
+//
+//  Created by Groot on 11/19/18.
+//  Copyright © 2018 Bart House. All rights reserved.
+//
+
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+// PLEASE READ
+//
+// You must define the build configuration setting DEVELOPMENT_TEAM
+// in order for the project to build successfully.  This setting provides
+// the identifier XCode needs in order to sign your builds.
+//
+// Your DEVELOPMENT_TEAM can be found by opening Keychain Access
+// (found by Finder->Applications->Utilities).  Click on "My Certificates".
+// Look for your "Mac Developer" certificate.  Right click on
+// the certificate to open a dialog that shows certificate details.
+// Look for "Organizational Unit" among the details.  This ten digit value
+// is your development team identifier.
+//
+// Once found, you now need to create a file named "XCodeLocal.xcconfig"
+// in the same folder as "XCode.xcconfig".  This file should contain at
+// least one line that defines your DEVELOPMENT_TEAM. The line should have
+// the form:
+//   DEVELOPMENT_TEAM = XXXXXXXXXX
+//
+// If you know what you are doing, it can also have other build settings
+// you wish to override.
+//
+// This new file is ignored by git and should never be submitted to the
+// repository.  It is meant to be local to you machine only.
+//
+
+// Include locally provided config file that must define DEVELOPMENT_TEAM
+#include? "XCodeLocal.xcconfig"