diff --git a/SDL/CMakeLists.txt b/SDL/CMakeLists.txt
index 7ceba4a..c1b8172 100644
--- a/SDL/CMakeLists.txt
+++ b/SDL/CMakeLists.txt
@@ -47,6 +47,7 @@ endif()
 
 if(SDL_FOUND)
 if(UNIX)
+find_package ( UnixCommands REQUIRED ) # bash
 join_paths(libdir "\${prefix}" "${CMAKE_INSTALL_LIBDIR}")
 join_paths(includedir "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
 add_custom_command(OUTPUT SDL_rwops_zzip.pc
diff --git a/zzip/CMakeLists.txt b/zzip/CMakeLists.txt
index a9f6e3a..2cdd275 100644
--- a/zzip/CMakeLists.txt
+++ b/zzip/CMakeLists.txt
@@ -194,6 +194,7 @@ SET_TARGET_PROPERTIES(libzzipmmapped PROPERTIES VERSION ${VERNUM}.${FIXNUM} SOVE
 endif()
 
 if(ZZIPCOMPAT)
+find_package ( UnixCommands REQUIRED ) # bash
 add_custom_command(OUTPUT compat/zzip.h
    COMMAND ${BASH} -c "rm -rf compat; mkdir compat"
    COMMAND ${BASH} -c "echo '#ifndef ZZIP_WARNING'     > compat/zzip.h"
@@ -215,6 +216,7 @@ add_custom_target(compat ALL DEPENDS compat/zzip.h)
 endif()
 
 if(UNIX)
+find_package ( UnixCommands REQUIRED ) # bash
 join_paths(libdir "\${prefix}" "${CMAKE_INSTALL_LIBDIR}")
 join_paths(includedir "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
 add_custom_command(OUTPUT zziplib.pc
diff --git a/zzipwrap/CMakeLists.txt b/zzipwrap/CMakeLists.txt
index 220d93b..d0bf1ae 100644
--- a/zzipwrap/CMakeLists.txt
+++ b/zzipwrap/CMakeLists.txt
@@ -49,6 +49,7 @@ target_link_libraries(zzipwrap libzzipwrap )
 target_include_directories(zzipwrap PRIVATE "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}")
 
 if(UNIX)
+find_package ( UnixCommands REQUIRED ) # bash
 join_paths(libdir "\${prefix}" "${CMAKE_INSTALL_LIBDIR}")
 join_paths(includedir "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
 add_custom_command(OUTPUT zzipwrap.pc