diff --git a/c/CMakeLists.txt b/c/CMakeLists.txt
index c929d71f5..d7239832b 100644
--- a/c/CMakeLists.txt
+++ b/c/CMakeLists.txt
@@ -330,6 +330,30 @@ function(join_paths joined_path first_path_segment)
     set(${joined_path} "${temp_path}" PARENT_SCOPE)
 endfunction()
 
+# In-place rewrite a list of strings `requires` into a comma separated string.
+#
+# TODO: Replace function with list(JOIN) when updating to CMake 3.12
+function(join_pkg_config_requires requires)
+  set(_requires "${${requires}}") # avoid shadowing issues, e.g. "${requires}"=len
+  list(LENGTH "${requires}" len)
+  set(idx 1)
+  foreach(req IN LISTS _requires)
+    string(APPEND acc "${req}")
+    if(idx LESS len)
+      string(APPEND acc ", ")
+    endif()
+    math(EXPR idx "${idx} + 1")
+  endforeach()
+  set("${requires}" "${acc}" PARENT_SCOPE)
+endfunction()
+
+# calculate pkg-config requirements
+if(BLAKE3_USE_TBB)
+  list(APPEND PKG_CONFIG_REQUIRES "tbb >= ${TBB_VERSION}")
+endif()
+
+# pkg-config support
+join_pkg_config_requires(PKG_CONFIG_REQUIRES)
 join_paths(PKG_CONFIG_INSTALL_LIBDIR "\${prefix}" "${CMAKE_INSTALL_LIBDIR}")
 join_paths(PKG_CONFIG_INSTALL_INCLUDEDIR "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
 configure_file(libblake3.pc.in libblake3.pc @ONLY)
diff --git a/c/blake3-config.cmake.in b/c/blake3-config.cmake.in
index 071552be2..92cf395b8 100644
--- a/c/blake3-config.cmake.in
+++ b/c/blake3-config.cmake.in
@@ -1,5 +1,14 @@
 @PACKAGE_INIT@
 
+include(CMakeFindDependencyMacro)
+
+# Remember TBB option state
+set(BLAKE3_USE_TBB @BLAKE3_USE_TBB@)
+
+if(BLAKE3_USE_TBB)
+    find_dependency(TBB @TBB_VERSION@)
+endif()
+
 include("${CMAKE_CURRENT_LIST_DIR}/blake3-targets.cmake")
 
-check_required_components(blake3)
\ No newline at end of file
+check_required_components(blake3)
diff --git a/c/libblake3.pc.in b/c/libblake3.pc.in
index 06f2c7a9b..900913b1f 100644
--- a/c/libblake3.pc.in
+++ b/c/libblake3.pc.in
@@ -7,6 +7,6 @@ Name: @PROJECT_NAME@
 Description: @PROJECT_DESCRIPTION@
 Version: @PROJECT_VERSION@
 
-Requires:
+Requires: @PKG_CONFIG_REQUIRES@
 Libs: -L"${libdir}" -lblake3
 Cflags: -I"${includedir}" @BLAKE3_PKGCONFIG_CFLAGS@