diff --git a/hawk/bin/Makefile.am b/hawk/bin/Makefile.am
index 6e0a6144..133f021f 100644
--- a/hawk/bin/Makefile.am
+++ b/hawk/bin/Makefile.am
@@ -14,6 +14,13 @@ LDFLAGS_ALL_COMMON = -L$(abs_builddir) -L$(abs_builddir)/../lib -L$(libdir)
 
 CPPFLAGS_BIN_COMMON = $(CPPFLAGS_ALL_COMMON)
 LDFLAGS_BIN_COMMON = $(LDFLAGS_ALL_COMMON) -no-undefined
+
+##
+## -lm may get omitted from dependency_libs in libhawk.la.
+## the generated libtool in the build directory may include -lm in postdeps
+## dependency_libs excludes items in postdeps.
+## specify -lm explicitly to satisfy dependency regardless of libtool behavior.
+##
 LIBADD_BIN_COMMON = $(LIBM) 
 
 bin_PROGRAMS = hawk
diff --git a/hawk/t/Makefile.am b/hawk/t/Makefile.am
index 795960c8..420a929c 100644
--- a/hawk/t/Makefile.am
+++ b/hawk/t/Makefile.am
@@ -11,7 +11,7 @@ AM_CPPFLAGS = \
 	-I$(includedir)
 
 AM_LDFLAGS = -L$(abs_builddir)/../lib  -L$(libdir)
-LDADD = 
+LDADD = $(LIBM)
 
 check_SCRIPTS = h-001.hawk h-002.hawk
 ##noinst_SCRIPTS = $(check_SCRIPTS)
diff --git a/hawk/t/Makefile.in b/hawk/t/Makefile.in
index 010f2a60..0e911804 100644
--- a/hawk/t/Makefile.in
+++ b/hawk/t/Makefile.in
@@ -110,14 +110,15 @@ CONFIG_CLEAN_VPATH_FILES =
 am_t_001_OBJECTS = t-001.$(OBJEXT)
 t_001_OBJECTS = $(am_t_001_OBJECTS)
 t_001_LDADD = $(LDADD)
-t_001_DEPENDENCIES =
+am__DEPENDENCIES_1 =
+t_001_DEPENDENCIES = $(am__DEPENDENCIES_1)
 AM_V_lt = $(am__v_lt_@AM_V@)
 am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
 am__v_lt_0 = --silent
 am__v_lt_1 = 
 am_t_002_OBJECTS = t-002.$(OBJEXT)
 t_002_OBJECTS = $(am_t_002_OBJECTS)
-am__DEPENDENCIES_1 =
+am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1)
 am_t_003_OBJECTS = t-003.$(OBJEXT)
 t_003_OBJECTS = $(am_t_003_OBJECTS)
 am_t_004_OBJECTS = t-004.$(OBJEXT)
@@ -557,7 +558,7 @@ AM_CPPFLAGS = \
 	-I$(includedir)
 
 AM_LDFLAGS = -L$(abs_builddir)/../lib  -L$(libdir)
-LDADD = 
+LDADD = $(LIBM)
 check_SCRIPTS = h-001.hawk h-002.hawk
 EXTRA_DIST = $(check_SCRIPTS)
 t_001_SOURCES = t-001.c t.h
diff --git a/hawk/tools/Makefile.am b/hawk/tools/Makefile.am
index 81089d2d..cad456cd 100644
--- a/hawk/tools/Makefile.am
+++ b/hawk/tools/Makefile.am
@@ -11,7 +11,7 @@ LDFLAGS_ALL_COMMON = -L$(abs_builddir) -L$(abs_builddir)/../lib -L$(libdir)
 
 CPPFLAGS_BIN_COMMON = $(CPPFLAGS_ALL_COMMON)
 LDFLAGS_BIN_COMMON = $(LDFLAGS_ALL_COMMON) -version-info 1:0:0 -no-undefined
-LIBADD_BIN_COMMON = $(LIBM) 
+LIBADD_BIN_COMMON =
 
 bin_PROGRAMS = uni-case uni-prop
 
diff --git a/hawk/tools/Makefile.in b/hawk/tools/Makefile.in
index 6e3e8386..71029c56 100644
--- a/hawk/tools/Makefile.in
+++ b/hawk/tools/Makefile.in
@@ -112,7 +112,6 @@ PROGRAMS = $(bin_PROGRAMS)
 am_uni_case_OBJECTS = uni_case-uni-case.$(OBJEXT)
 uni_case_OBJECTS = $(am_uni_case_OBJECTS)
 am__DEPENDENCIES_1 =
-am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1)
 AM_V_lt = $(am__v_lt_@AM_V@)
 am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
 am__v_lt_0 = --silent
@@ -349,7 +348,7 @@ CPPFLAGS_ALL_COMMON = \
 LDFLAGS_ALL_COMMON = -L$(abs_builddir) -L$(abs_builddir)/../lib -L$(libdir)
 CPPFLAGS_BIN_COMMON = $(CPPFLAGS_ALL_COMMON)
 LDFLAGS_BIN_COMMON = $(LDFLAGS_ALL_COMMON) -version-info 1:0:0 -no-undefined
-LIBADD_BIN_COMMON = $(LIBM) 
+LIBADD_BIN_COMMON = 
 uni_case_SOURCES = uni-case.c
 uni_case_CPPFLAGS = $(CPPFLAGS_ALL_COMMON)
 uni_case_LDFLAGS = $(LDFLAGS_ALL_COMMON)