ICU-20813 Fix Multi-line comment in umachine.h
- This comment failed on gcc. Split it into two lines.
diff --git a/icu4c/source/common/unicode/umachine.h b/icu4c/source/common/unicode/umachine.h
index 5414008..c52984c 100644
--- a/icu4c/source/common/unicode/umachine.h
+++ b/icu4c/source/common/unicode/umachine.h
@@ -155,8 +155,9 @@
// such code the wrapper is itself defined as macros so that it's possible to
// build ICU 65 and later with the old macro behaviour, like this:
//
-// CPPFLAGS='-DUPRV_BLOCK_MACRO_BEGIN="" -DUPRV_BLOCK_MACRO_END=""' \
+// export CPPFLAGS='-DUPRV_BLOCK_MACRO_BEGIN="" -DUPRV_BLOCK_MACRO_END=""'
// runConfigureICU ...
+//
/**
* \def UPRV_BLOCK_MACRO_BEGIN
