Don't use -Werror.
--- Configurations/Config.xcconfig.orig	2012-05-17 12:52:37.000000000 -0500
+++ Configurations/Config.xcconfig	2019-02-01 11:53:15.000000000 -0600
@@ -46,7 +46,7 @@
 GCC_WARN_UNUSED_PARAMETER = NO
 GCC_WARN_UNDECLARED_SELECTOR = NO
 
-WARNING_CFLAGS = -Wall -Wno-unused-parameter -Werror -Wundef -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Wmissing-format-attribute -Wpacked -Wredundant-decls -Winline -Wdisabled-optimization -Wformat=2 -Winvalid-pch
+WARNING_CFLAGS = -Wall -Wno-unused-parameter -Wundef -Wendif-labels -Wpointer-arith -Wcast-align -Wwrite-strings -Wmissing-format-attribute -Wpacked -Wredundant-decls -Winline -Wdisabled-optimization -Wformat=2 -Winvalid-pch
 
 PRODUCT_NAME = cocoaDialog
 WRAPPER_EXTENSION = app
--- Configurations/ConfigRelease.xcconfig.orig	2012-05-17 12:52:37.000000000 -0500
+++ Configurations/ConfigRelease.xcconfig	2019-02-01 12:13:43.000000000 -0600
@@ -5,7 +5,7 @@
 DEBUG_INFORMATION_FORMAT = dwarf-with-dsym
 GCC_GENERATE_DEBUGGING_SYMBOLS = NO
 DEAD_CODE_STRIPPING = YES
-GCC_TREAT_WARNINGS_AS_ERRORS = YES
+GCC_TREAT_WARNINGS_AS_ERRORS = NO
 GCC_WARN_UNINITIALIZED_AUTOS = YES
 STRIP_INSTALLED_PRODUCT = YES
 COPY_PHASE_STRIP = NO