diff -up src/module_list.py.orig src/module_list.py
--- src/module_list.py.orig	2018-10-25 11:40:44.400943439 -0600
+++ src/module_list.py	2018-10-25 16:16:46.618825285 -0600
@@ -45,6 +45,9 @@ zlib_libs = zlib_pc['libraries']
 zlib_library_dirs = zlib_pc['library_dirs']
 zlib_include_dirs = zlib_pc['include_dirs']
 
+# Singular
+singular_incs = [SAGE_INC + '/singular', SAGE_INC + '/factory']
+
 #########################################################
 ### M4RI flags
 #########################################################
@@ -61,6 +64,14 @@ except ValueError:
     pass
 
 #########################################################
+### ARB flags
+#########################################################
+
+arb_include_dirs = [os.path.join(SAGE_INC, 'flint'),
+                    os.path.join(SAGE_INC, 'arb')]
+arb_libs = ['arb']
+
+#########################################################
 ### Library order
 #########################################################
 
@@ -134,7 +145,8 @@ ext_modules = [
                language='c++',
                libraries = ["gmp", "m", "ntl"]),
 
-    Extension('*', sources = ['sage/algebras/letterplace/*.pyx']),
+    Extension('*', sources = ['sage/algebras/letterplace/*.pyx'],
+              include_dirs = singular_incs),
 
     Extension('*', sources = ['sage/algebras/finite_dimensional_algebras/*.pyx']),
 
@@ -524,7 +536,8 @@ ext_modules = [
                                                         [])),
 
     Extension('sage.libs.lrcalc.lrcalc',
-              sources = ["sage/libs/lrcalc/lrcalc.pyx"]),
+              sources = ["sage/libs/lrcalc/lrcalc.pyx"],
+              include_dirs = [os.path.join(SAGE_INC, 'lrcalc')]),
 
     OptionalExtension("sage.libs.meataxe",
               sources = ['sage/libs/meataxe.pyx'],
@@ -546,23 +559,28 @@ ext_modules = [
               sources = ['sage/libs/readline.pyx'],
               libraries = ['readline']),
 
-    Extension('*', sources = ['sage/libs/singular/*.pyx']),
+    Extension('*', sources = ['sage/libs/singular/*.pyx'],
+              include_dirs = singular_incs),
 
     Extension('sage.libs.symmetrica.symmetrica',
               sources = ["sage/libs/symmetrica/symmetrica.pyx"],
               libraries = ["symmetrica"]),
 
     Extension('sage.libs.mpmath.utils',
-              sources = ["sage/libs/mpmath/utils.pyx"]),
+              sources = ["sage/libs/mpmath/utils.pyx"],
+              include_dirs = [os.path.join(SAGE_INC, "flint")]),
 
     Extension('sage.libs.mpmath.ext_impl',
-              sources = ["sage/libs/mpmath/ext_impl.pyx"]),
+              sources = ["sage/libs/mpmath/ext_impl.pyx"],
+              include_dirs = [os.path.join(SAGE_INC, "flint")]),
 
     Extension('sage.libs.mpmath.ext_main',
-              sources = ["sage/libs/mpmath/ext_main.pyx"]),
+              sources = ["sage/libs/mpmath/ext_main.pyx"],
+              include_dirs = [os.path.join(SAGE_INC, "flint")]),
 
     Extension('sage.libs.mpmath.ext_libmp',
-              sources = ["sage/libs/mpmath/ext_libmp.pyx"]),
+              sources = ["sage/libs/mpmath/ext_libmp.pyx"],
+              include_dirs = [os.path.join(SAGE_INC, "flint")]),
 
     ###################################
     ##
@@ -570,7 +588,8 @@ ext_modules = [
     ##
     ###################################
 
-    Extension('*', ["sage/libs/arb/*.pyx"]),
+    Extension('*', ["sage/libs/arb/*.pyx"],
+              include_dirs = arb_include_dirs),
 
     ###################################
     ##
@@ -742,7 +761,8 @@ ext_modules = [
 
     Extension("sage.matrix.matrix_complex_ball_dense",
               ["sage/matrix/matrix_complex_ball_dense.pyx"],
-              libraries=['arb']),
+              include_dirs = arb_include_dirs,
+              libraries=arb_libs),
 
     Extension('sage.matrix.matrix_complex_double_dense',
               sources = ['sage/matrix/matrix_complex_double_dense.pyx']),
@@ -750,6 +770,7 @@ ext_modules = [
     Extension('sage.matrix.matrix_cyclo_dense',
               sources = ['sage/matrix/matrix_cyclo_dense.pyx'],
               language = "c++",
+              include_dirs = arb_include_dirs,
               libraries=['ntl']),
 
     Extension('sage.matrix.matrix_gap',
@@ -812,6 +833,7 @@ ext_modules = [
               sources = ['sage/matrix/matrix_modn_sparse.pyx']),
 
     Extension('sage.matrix.matrix_mpolynomial_dense',
+              include_dirs = singular_incs,
               sources = ['sage/matrix/matrix_mpolynomial_dense.pyx']),
 
     Extension('sage.matrix.matrix_polynomial_dense',
@@ -1109,7 +1131,8 @@ ext_modules = [
               language = 'c++'),
 
     Extension("sage.rings.complex_arb",
-              ["sage/rings/complex_arb.pyx"]),
+              ["sage/rings/complex_arb.pyx"],
+              include_dirs = arb_include_dirs),
 
     Extension('sage.rings.complex_double',
               sources = ['sage/rings/complex_double.pyx'],
@@ -1179,7 +1202,8 @@ ext_modules = [
               sources = ['sage/rings/real_interval_absolute.pyx']),
 
     Extension("sage.rings.real_arb",
-              ["sage/rings/real_arb.pyx"]),
+              ["sage/rings/real_arb.pyx"],
+              include_dirs = arb_include_dirs),
 
     Extension('sage.rings.real_lazy',
               sources = ['sage/rings/real_lazy.pyx']),
@@ -1262,6 +1286,7 @@ ext_modules = [
 
     Extension('sage.rings.number_field.number_field_element_quadratic',
               sources = ['sage/rings/number_field/number_field_element_quadratic.pyx'],
+              include_dirs = arb_include_dirs,
               libraries=['ntl'],
               language = 'c++'),
 
@@ -1401,12 +1426,15 @@ ext_modules = [
               sources = ['sage/rings/polynomial/multi_polynomial.pyx']),
 
     Extension('sage.rings.polynomial.multi_polynomial_ideal_libsingular',
+              include_dirs = singular_incs,
               sources = ['sage/rings/polynomial/multi_polynomial_ideal_libsingular.pyx']),
 
     Extension('sage.rings.polynomial.plural',
+              include_dirs = singular_incs,
               sources = ['sage/rings/polynomial/plural.pyx']),
 
     Extension('sage.rings.polynomial.multi_polynomial_libsingular',
+              include_dirs = singular_incs,
               sources = ['sage/rings/polynomial/multi_polynomial_libsingular.pyx']),
 
     Extension('sage.rings.polynomial.multi_polynomial_ring_base',
@@ -1419,7 +1447,8 @@ ext_modules = [
               sources = ['sage/rings/polynomial/polydict.pyx']),
 
     Extension('sage.rings.polynomial.polynomial_complex_arb',
-               sources = ['sage/rings/polynomial/polynomial_complex_arb.pyx']),
+               sources = ['sage/rings/polynomial/polynomial_complex_arb.pyx'],
+               include_dirs = arb_include_dirs),
 
     Extension('sage.rings.polynomial.polynomial_compiled',
                sources = ['sage/rings/polynomial/polynomial_compiled.pyx']),
diff -du src/setup.py.orig src/setup.py
--- src/setup.py.orig	2018-10-25 14:05:20.779815082 -0600
+++ src/setup.py	2018-10-25 16:16:46.619825283 -0600
@@ -85,6 +85,7 @@ except KeyError:
 
 # search for dependencies and add to gcc -I<path>
 include_dirs = sage_include_directories(use_sources=True)
+include_dirs.extend(['@@CYSIGNALS@@'])
 
 # Look for libraries in $SAGE_LOCAL/lib
 library_dirs = [os.path.join(SAGE_LOCAL, "lib")]