From 71f746c057a66d5ae0dfdb5d439bc49592c0d16e Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Fri, 21 Apr 2023 12:03:26 +0100
Subject: [PATCH] cmake: Include `include` directory for subtree builds

---
 src/CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cd1d6f00ee43f..720377c8eaff6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -31,7 +31,9 @@ endif()
 get_target_property(use_pic secp256k1 POSITION_INDEPENDENT_CODE)
 set_target_properties(secp256k1_precomputed PROPERTIES POSITION_INDEPENDENT_CODE ${use_pic})
 
-target_include_directories(secp256k1 PUBLIC
+target_include_directories(secp256k1 INTERFACE
+  # Add the include path for parent projects so that they don't have to manually add it.
+  $<BUILD_INTERFACE:$<$<NOT:$<BOOL:${PROJECT_IS_TOP_LEVEL}>>:${PROJECT_SOURCE_DIR}/include>>
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 set_target_properties(secp256k1 PROPERTIES