diff --git a/apps/build.info b/apps/build.info
index 8615f2ff87..f365aee56f 100644
--- a/apps/build.info
+++ b/apps/build.info
@@ -1,4 +1,4 @@
-{- use File::Spec::Functions qw/catdir abs2rel/; -}
+{- use File::Spec::Functions qw/catdir rel2abs/; -}
 PROGRAMS=openssl
 SOURCE[openssl]=\
         openssl.c \
@@ -10,7 +10,7 @@ SOURCE[openssl]=\
         srp.c ts.c verify.c version.c x509.c rehash.c \
         apps.c opt.c s_cb.c s_socket.c \
         app_rand.c
-INCLUDE[openssl]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[openssl]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[openssl]=../libssl
 
 SCRIPTS=CA.pl
diff --git a/build.info b/build.info
index 043947c012..a518efeae6 100644
--- a/build.info
+++ b/build.info
@@ -1,7 +1,7 @@
-{- use File::Spec::Functions qw/catdir abs2rel/; -}
+{- use File::Spec::Functions qw/catdir rel2abs/; -}
 LIBS=libcrypto libssl
 ORDINALS[libcrypto]=crypto
 ORDINALS[libssl]=ssl
-INCLUDE[libcrypto]={- catdir(abs2rel($builddir,$sourcedir),"include") -} . crypto/include include
-INCLUDE[libssl]={- catdir(abs2rel($builddir,$sourcedir),"include") -} . include
+INCLUDE[libcrypto]={- rel2abs(catdir($builddir,"include")) -} . crypto/include include
+INCLUDE[libssl]={- rel2abs(catdir($builddir,"include")) -} . include
 DEPEND[libssl]=libcrypto
diff --git a/engines/build.info b/engines/build.info
index 88c5bf7736..0c8e04b052 100644
--- a/engines/build.info
+++ b/engines/build.info
@@ -1,4 +1,4 @@
-{- use File::Spec::Functions qw/:DEFAULT abs2rel/; -}
+{- use File::Spec::Functions qw/:DEFAULT rel2abs/; -}
 IF[{- $config{no_shared} -}]
  LIBS=../libcrypto
  SOURCE[../libcrypto]=\
@@ -9,14 +9,14 @@ ELSE
  ENGINES=libpadlock libcapi libdasync libossltest
  SOURCE[libpadlock]=e_padlock.c {- $target{padlock_asm_src} -}
  DEPEND[libpadlock]=../libcrypto
- INCLUDE[libpadlock]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+ INCLUDE[libpadlock]={- rel2abs(catdir($builddir,"../include")) -} ../include
  SOURCE[libcapi]=e_capi.c
  DEPEND[libcapi]=../libcrypto
- INCLUDE[libcapi]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+ INCLUDE[libcapi]={- rel2abs(catdir($builddir,"../include")) -} ../include
  SOURCE[libdasync]=e_dasync.c
  DEPEND[libdasync]=../libcrypto
- INCLUDE[libdasync]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+ INCLUDE[libdasync]={- rel2abs(catdir($builddir,"../include")) -} ../include
  SOURCE[libossltest]=e_ossltest.c
  DEPEND[libossltest]=../libcrypto
- INCLUDE[libossltest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+ INCLUDE[libossltest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 ENDIF
diff --git a/test/build.info b/test/build.info
index 5b696c5a65..bf9feadf8c 100644
--- a/test/build.info
+++ b/test/build.info
@@ -1,4 +1,4 @@
-{- use File::Spec::Functions qw/catdir abs2rel/; -}
+{- use File::Spec::Functions qw/catdir rel2abs/; -}
 PROGRAMS=\
         nptest bntest \
         ectest ecdsatest ecdhtest gmdifftest pbelutest ideatest \
@@ -16,193 +16,193 @@ PROGRAMS=\
         dtlsv1listentest
 
 SOURCE[nptest]=nptest.c
-INCLUDE[nptest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[nptest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[nptest]=../libcrypto
 
 SOURCE[bntest]=bntest.c
-INCLUDE[bntest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../crypto/include ../include
+INCLUDE[bntest]={- rel2abs(catdir($builddir,"../include")) -} .. ../crypto/include ../include
 DEPEND[bntest]=../libcrypto
 
 SOURCE[ectest]=ectest.c
-INCLUDE[ectest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[ectest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[ectest]=../libcrypto
 
 SOURCE[ecdsatest]=ecdsatest.c
-INCLUDE[ecdsatest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[ecdsatest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[ecdsatest]=../libcrypto
 
 SOURCE[ecdhtest]=ecdhtest.c
-INCLUDE[ecdhtest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[ecdhtest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[ecdhtest]=../libcrypto
 
 SOURCE[gmdifftest]=gmdifftest.c
-INCLUDE[gmdifftest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[gmdifftest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[gmdifftest]=../libcrypto
 
 SOURCE[pbelutest]=pbelutest.c
-INCLUDE[pbelutest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[pbelutest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[pbelutest]=../libcrypto
 
 SOURCE[ideatest]=ideatest.c
-INCLUDE[ideatest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[ideatest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[ideatest]=../libcrypto
 
 SOURCE[md2test]=md2test.c
-INCLUDE[md2test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[md2test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[md2test]=../libcrypto
 
 SOURCE[md4test]=md4test.c
-INCLUDE[md4test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[md4test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[md4test]=../libcrypto
 
 SOURCE[md5test]=md5test.c
-INCLUDE[md5test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[md5test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[md5test]=../libcrypto
 
 SOURCE[hmactest]=hmactest.c
-INCLUDE[hmactest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[hmactest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[hmactest]=../libcrypto
 
 SOURCE[wp_test]=wp_test.c
-INCLUDE[wp_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[wp_test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[wp_test]=../libcrypto
 
 SOURCE[rc2test]=rc2test.c
-INCLUDE[rc2test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[rc2test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[rc2test]=../libcrypto
 
 SOURCE[rc4test]=rc4test.c
-INCLUDE[rc4test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[rc4test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[rc4test]=../libcrypto
 
 SOURCE[rc5test]=rc5test.c
-INCLUDE[rc5test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[rc5test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[rc5test]=../libcrypto
 
 SOURCE[destest]=destest.c
-INCLUDE[destest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[destest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[destest]=../libcrypto
 
 SOURCE[sha1test]=sha1test.c
-INCLUDE[sha1test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[sha1test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[sha1test]=../libcrypto
 
 SOURCE[sha256t]=sha256t.c
-INCLUDE[sha256t]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[sha256t]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[sha256t]=../libcrypto
 
 SOURCE[sha512t]=sha512t.c
-INCLUDE[sha512t]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[sha512t]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[sha512t]=../libcrypto
 
 SOURCE[mdc2test]=mdc2test.c
-INCLUDE[mdc2test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[mdc2test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[mdc2test]=../libcrypto
 
 SOURCE[rmdtest]=rmdtest.c
-INCLUDE[rmdtest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[rmdtest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[rmdtest]=../libcrypto
 
 SOURCE[randtest]=randtest.c
-INCLUDE[randtest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[randtest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[randtest]=../libcrypto
 
 SOURCE[dhtest]=dhtest.c
-INCLUDE[dhtest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[dhtest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[dhtest]=../libcrypto
 
 SOURCE[enginetest]=enginetest.c
-INCLUDE[enginetest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[enginetest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[enginetest]=../libcrypto
 
 SOURCE[casttest]=casttest.c
-INCLUDE[casttest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[casttest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[casttest]=../libcrypto
 
 SOURCE[bftest]=bftest.c
-INCLUDE[bftest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[bftest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[bftest]=../libcrypto
 
 SOURCE[ssltest]=ssltest.c
-INCLUDE[ssltest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[ssltest]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[ssltest]=../libcrypto ../libssl
 
 SOURCE[dsatest]=dsatest.c
-INCLUDE[dsatest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[dsatest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[dsatest]=../libcrypto
 
 SOURCE[exptest]=exptest.c
-INCLUDE[exptest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[exptest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[exptest]=../libcrypto
 
 SOURCE[rsa_test]=rsa_test.c
-INCLUDE[rsa_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[rsa_test]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[rsa_test]=../libcrypto
 
 SOURCE[evp_test]=evp_test.c
-INCLUDE[evp_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[evp_test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[evp_test]=../libcrypto
 
 SOURCE[evp_extra_test]=evp_extra_test.c
-INCLUDE[evp_extra_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[evp_extra_test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[evp_extra_test]=../libcrypto
 
 SOURCE[igetest]=igetest.c
-INCLUDE[igetest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[igetest]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[igetest]=../libcrypto
 
 SOURCE[jpaketest]=jpaketest.c
-INCLUDE[jpaketest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[jpaketest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[jpaketest]=../libcrypto
 
 SOURCE[v3nametest]=v3nametest.c
-INCLUDE[v3nametest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[v3nametest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[v3nametest]=../libcrypto
 
 SOURCE[danetest]=danetest.c
-INCLUDE[danetest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[danetest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[danetest]=../libcrypto ../libssl
 
 SOURCE[heartbeat_test]=heartbeat_test.c testutil.c
-INCLUDE[heartbeat_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[heartbeat_test]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[heartbeat_test]=../libcrypto ../libssl
 
 SOURCE[p5_crpt2_test]=p5_crpt2_test.c
-INCLUDE[p5_crpt2_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[p5_crpt2_test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[p5_crpt2_test]=../libcrypto
 
 SOURCE[constant_time_test]=constant_time_test.c
-INCLUDE[constant_time_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[constant_time_test]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[constant_time_test]=../libcrypto
 
 SOURCE[verify_extra_test]=verify_extra_test.c
-INCLUDE[verify_extra_test]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[verify_extra_test]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[verify_extra_test]=../libcrypto
 
 SOURCE[clienthellotest]=clienthellotest.c
-INCLUDE[clienthellotest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[clienthellotest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[clienthellotest]=../libcrypto ../libssl
 
 SOURCE[packettest]=packettest.c
-INCLUDE[packettest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[packettest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[packettest]=../libcrypto
 
 SOURCE[asynctest]=asynctest.c
-INCLUDE[asynctest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[asynctest]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[asynctest]=../libcrypto
 
 SOURCE[secmemtest]=secmemtest.c
-INCLUDE[secmemtest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[secmemtest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[secmemtest]=../libcrypto
 
 SOURCE[srptest]=srptest.c
-INCLUDE[srptest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[srptest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[srptest]=../libcrypto
 
 SOURCE[memleaktest]=memleaktest.c
-INCLUDE[memleaktest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} ../include
+INCLUDE[memleaktest]={- rel2abs(catdir($builddir,"../include")) -} ../include
 DEPEND[memleaktest]=../libcrypto
 
 SOURCE[dtlsv1listentest]=dtlsv1listentest.c
-INCLUDE[dtlsv1listentest]={- catdir(abs2rel($builddir,$sourcedir),"../include") -} .. ../include
+INCLUDE[dtlsv1listentest]={- rel2abs(catdir($builddir,"../include")) -} .. ../include
 DEPEND[dtlsv1listentest]=../libssl